refactor(prefs): create the settings store through DataStore.Builder

The store is now built through DataStore.Builder instead of the
preferencesDataStore delegate.

README.md

@@ -15,9 +15,9 @@ The app stores dictionaries as DictZip files and builds compact binary indexes f
 
 ## Screenshots
 
-[<img src="fastlane/metadata/android/en-US/images/phoneScreenshots/1.png" width="160" alt="ReSearch settings screen">](fastlane/metadata/android/en-US/images/phoneScreenshots/1.png)
-[<img src="fastlane/metadata/android/en-US/images/phoneScreenshots/2.png" width="160" alt="ReSearch search results screen">](fastlane/metadata/android/en-US/images/phoneScreenshots/2.png)
-[<img src="fastlane/metadata/android/en-US/images/phoneScreenshots/3.png" width="160" alt="ReSearch about screen">](fastlane/metadata/android/en-US/images/phoneScreenshots/3.png)
+[<img src="fastlane/metadata/android/en-US/images/phoneScreenshots/1.png" width="160" alt="ReSearch search results screen">](fastlane/metadata/android/en-US/images/phoneScreenshots/1.png)
+[<img src="fastlane/metadata/android/en-US/images/phoneScreenshots/2.png" width="160" alt="ReSearch search history sheet">](fastlane/metadata/android/en-US/images/phoneScreenshots/2.png)
+[<img src="fastlane/metadata/android/en-US/images/phoneScreenshots/3.png" width="160" alt="ReSearch settings screen">](fastlane/metadata/android/en-US/images/phoneScreenshots/3.png)
 
 ## Features
 
@@ -85,15 +85,15 @@ The main search screen remains usable as long as at least one indexed dictionary
 
 ## Tech Stack
 
-- Kotlin 2.4.20
+- Kotlin 2.4.21
 - Jetpack Compose (BOM 2026.09.00)
-- Material 3
+- Material 3 1.5.0-beta01
 - Coroutines and Flow 1.11.0
-- DataStore Preferences 1.2.1
-- Paging 3.5.1
+- DataStore Preferences 1.3.0
+- Paging 3.5.3
 - OkHttp 5.5.0
-- kotlinx.serialization 1.11.0
-- AboutLibraries 15.2.0 metadata generation
+- kotlinx.serialization 1.12.0
+- AboutLibraries 15.3.0 metadata generation
 - Android Gradle Plugin 9.4.1
 
 ## Build

app/build.gradle.kts

@@ -92,8 +92,8 @@ android {
         applicationId = "com.example.research"
         minSdk = project.property("minSdk").toString().toInt()
         targetSdk = project.property("targetSdk").toString().toInt()
-        versionCode = 10
-        versionName = "1.7.0"
+        versionCode = 12
+        versionName = "1.8.0"
 
         vectorDrawables {
             useSupportLibrary = true
@@ -164,26 +164,17 @@ dependencies {
     implementation(libs.androidx.lifecycle.runtime.compose)
     implementation(libs.androidx.activity.compose)
     implementation(libs.androidx.documentfile)
-
     val composeBom = platform(libs.androidx.compose.bom)
     implementation(composeBom)
     implementation(libs.bundles.compose)
     implementation(libs.androidx.compose.material3.adaptive.layout)
     debugImplementation(libs.androidx.compose.runtime.tracing)
-
-
     implementation(libs.androidx.paging.runtime)
     implementation(libs.androidx.paging.compose)
     implementation(libs.androidx.profileinstaller)
-
     debugImplementation(libs.androidx.compose.ui.tooling)
-
     implementation(libs.androidx.datastore.preferences)
-
     implementation(libs.okhttp)
-
-    // Coroutines with Android-optimized dispatchers
     implementation(libs.kotlinx.coroutines.android)
-
     implementation(libs.kotlinx.serialization.json)
 }

app/src/debug/java/com/example/research/core/performance/ReSearchTrace.kt

@@ -13,9 +13,6 @@ object ReSearchTrace {
     const val DICTIONARY_EXTRACT = "ReSearch/Dictionary/Extract"
     const val DICTIONARY_INDEX = "ReSearch/Dictionary/Index"
     const val DICTIONARY_IMPORT = "ReSearch/Dictionary/Import"
-    const val FLOW_UPDATE_CARD_APPEAR = "ReSearch/Flow/UpdateCardAppear"
-    const val FLOW_UPDATING = "ReSearch/Flow/Updating"
-    const val FLOW_PROGRESS_DISAPPEAR = "ReSearch/Flow/ProgressDisappear"
 
     private val nextCookie = AtomicInteger()
 

app/src/main/baseline-prof.txt

@@ -1,54 +1,48 @@
-# Seeded from the measured ReSearch startup, search, scrolling, and article-opening hot paths.
-# Keep this profile checked in: release builders, including F-Droid, only compile it.
-# Updated 2026-06-25: Added optimized cache paths from performance optimization stages 1-4
+HSPLcom/example/research/ReSearchApplication**->**(**)**
+HSPLcom/example/research/MainActivity**->**(**)**
+HSPLcom/example/research/InitialLaunch**->**(**)**
+HSPLcom/example/research/DictionaryStatus**->**(**)**
+HSPLcom/example/research/core/**->**(**)**
+HSPLcom/example/research/common/ui/**->**(**)**
+HSPLcom/example/research/ui/theme/**->**(**)**
+HSPLcom/example/research/ui/navigation/**->**(**)**
+HSPLcom/example/research/data/local/preferences/**->**(**)**
+HSPLcom/example/research/data/parser/ResourceManager**->**(**)**
+HSPLcom/example/research/common/util/FileStorageManager**->**(**)**
+HSPLcom/example/research/common/util/DateUtils**->**(**)**
 
-HSPLcom/example/research/ReSearchApplication;->**(**)**
-HSPLcom/example/research/MainActivity;->**(**)**
-
-HSPLcom/example/research/common/ui/AppLocaleProviderKt**->**(**)**
-HSPLcom/example/research/common/ui/theme/ThemeKt**->**(**)**
-HSPLcom/example/research/ui/navigation/AppNavigationKt**->**(**)**
-
-HSPLcom/example/research/ui/main/MainScreenKt**->**(**)**
-HSPLcom/example/research/ui/main/AdaptiveMainScreenKt**->**(**)**
-HSPLcom/example/research/ui/main/components/MainTopBarKt**->**(**)**
-HSPLcom/example/research/ui/main/components/SearchResultsListKt**->**(**)**
-
-HSPLcom/example/research/feature/search/SearchViewModel**->**(**)**
-HSPLcom/example/research/data/paging/IndexEntryPagingSource**->**(**)**
+HSPLcom/example/research/ui/main/**->**(**)**
+HSPLandroidx/paging/**->**(**)**
+HSPLcom/example/research/feature/search/**->**(**)**
+HSPLcom/example/research/data/paging/**->**(**)**
 HSPLcom/example/research/data/parser/IndexSearcher**->**(**)**
-HSPLcom/example/research/data/parser/SearchRankingKt**->**(**)**
+HSPLcom/example/research/data/parser/FileSource**->**(**)**
+HSPLcom/example/research/data/parser/ResultsLruCache**->**(**)**
+HSPLcom/example/research/data/parser/MetadataLruCache**->**(**)**
+HSPLcom/example/research/data/parser/SearchRanking**->**(**)**
+HSPLcom/example/research/data/parser/SortKey**->**(**)**
 
-HSPLcom/example/research/data/repository/LocalDictionaryRepository**->**(**)**
-HSPLcom/example/research/data/repository/KotlinDictionaryEngine**->**(**)**
+HSPLcom/example/research/data/repository/**->**(**)**
+HSPLcom/example/research/data/dictzip/DictZipInputStream**->**(**)**
+HSPLcom/example/research/data/dictzip/DictZipRandomAccessFile**->**(**)**
+HSPLcom/example/research/data/dictzip/DictZipHeader**->**(**)**
 HSPLcom/example/research/data/parser/DslArticleReader**->**(**)**
-HSPLcom/example/research/ui/article/DslAnnotatedParser**->**(**)**
-HSPLcom/example/research/ui/article/ArticleScreenKt**->**(**)**
+HSPLcom/example/research/data/parser/LruCharsetCache**->**(**)**
+HSPLcom/example/research/ui/article/**->**(**)**
 
-# Hot paths for optimized article rendering (Stage 1)
-HSPLcom/example/research/ui/article/ArticleLinkText**->**(**)**
-HSPLcom/example/research/ui/article/ArticleState**->**(**)**
+HSPLcom/example/research/data/parser/Dsl**->**(**)**
+HSPLcom/example/research/data/parser/LineKind**->**(**)**
+HSPLcom/example/research/data/parser/ByteTrackingLineReader**->**(**)**
+HSPLcom/example/research/data/parser/Utf8Writer**->**(**)**
+
+HSPLcom/example/research/ui/settings/**->**(**)**
+HSPLcom/example/research/common/progress/**->**(**)**
+HSPLcom/example/research/feature/download/**->**(**)**
 
-# About screen (bonus optimization)
 HSPLcom/example/research/ui/about/AboutScreenKt**->**(**)**
 
-# Updated 2026-07-11: cover the settings/dictionary flow and the Compose framework.
-
-# Settings + dictionary management flow
-HSPLcom/example/research/ui/settings/**->**(**)**
-Lcom/example/research/ui/settings/**
-HSPLcom/example/research/common/ui/components/**->**(**)**
-Lcom/example/research/common/ui/components/**
-HSPLcom/example/research/common/progress/**->**(**)**
-Lcom/example/research/common/progress/**
-HSPLcom/example/research/feature/download/**->**(**)**
-Lcom/example/research/feature/download/**
-
-# Pre-verify the app classes already covered by method rules above
 Lcom/example/research/**
 
-# Compose framework: the alpha AARs ship near-empty baseline profiles, so first
-# compositions run interpreted without these rules.
 HSPLandroidx/compose/runtime/**->**(**)**
 Landroidx/compose/runtime/**
 HSPLandroidx/compose/ui/**->**(**)**
@@ -61,12 +55,10 @@ HSPLandroidx/compose/animation/**->**(**)**
 Landroidx/compose/animation/**
 HSPLandroidx/compose/material/**->**(**)**
 Landroidx/compose/material/**
-
-# Support libraries on the same cold path
 HSPLandroidx/lifecycle/**->**(**)**
 Landroidx/lifecycle/**
 HSPLandroidx/activity/compose/**->**(**)**
 Landroidx/activity/compose/**
 HSPLkotlinx/coroutines/**->**(**)**
 Lkotlinx/coroutines/**
-
+Landroidx/paging/**

app/src/main/java/com/example/research/DictionaryStatus.kt

@@ -7,7 +7,7 @@ sealed interface DictionaryStatus {
     data object Unknown : DictionaryStatus
     data object Checking : DictionaryStatus
     data object UpToDate : DictionaryStatus
-    data object NeedsUpdate : DictionaryStatus
+    data class NeedsUpdate(val sourceIds: Set<String>) : DictionaryStatus
     data object Empty : DictionaryStatus
     data class Error(val message: String) : DictionaryStatus
 }

app/src/main/java/com/example/research/common/progress/DictionaryProgressModel.kt

@@ -21,14 +21,16 @@ object DictionaryProgressModel {
         val progress: Float,
         val percent: Int,
         @param:StringRes val titleRes: Int,
+        val indeterminate: Boolean = false,
     ) {
         override fun equals(other: Any?): Boolean {
             if (this === other) return true
             if (other !is Snapshot) return false
-            return percent == other.percent && titleRes == other.titleRes
+            return percent == other.percent && titleRes == other.titleRes &&
+                indeterminate == other.indeterminate
         }
         override fun hashCode(): Int {
-            return 31 * percent + titleRes
+            return 31 * (31 * percent + titleRes) + indeterminate.hashCode()
         }
     }
     fun computeProgressSnapshot(
@@ -92,6 +94,7 @@ object DictionaryProgressModel {
             progress = p,
             percent = pct,
             titleRes = R.string.notification_download_title,
+            indeterminate = dl <= 0f,
         )
     }
 

app/src/main/java/com/example/research/common/progress/DictionaryProgressPresenter.kt

@@ -1,37 +1,86 @@
 package com.example.research.common.progress
 
+import android.os.SystemClock
 import kotlinx.coroutines.CoroutineDispatcher
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.launch
+import kotlin.time.Duration.Companion.milliseconds
 
 class DictionaryProgressPresenter(
-    scope: CoroutineScope,
+    private val scope: CoroutineScope,
     private val progressSnapshot: StateFlow<DictionaryProgressModel.Snapshot?>,
     private val notifications: NotificationPort,
-    mainDispatcher: CoroutineDispatcher = Dispatchers.Main,
+    private val mainDispatcher: CoroutineDispatcher = Dispatchers.Main,
 ) : PipelineTerminalUi {
+
+    private companion object {
+        val MIN_NOTIFICATION_INTERVAL = 500.milliseconds
+    }
+
     @Volatile
     private var terminalActive = false
 
+    private var lastShownTitleRes: Int = 0
+    private var lastEmitMs: Long = 0L
+    private var pendingSnapshot: DictionaryProgressModel.Snapshot? = null
+    private var flushJob: Job? = null
+
     init {
         scope.launch(mainDispatcher) {
             progressSnapshot.collect { snapshot ->
                 when {
                     snapshot == null -> {
+                        resetThrottle()
                         if (!terminalActive && notifications.hasActiveProgressNotification()) {
                             notifications.cancelProgressNotification()
                         }
                     }
-                    !terminalActive -> notifications.showProgress(snapshot.percent, snapshot.titleRes)
+                    !terminalActive -> emitThrottled(snapshot)
                 }
             }
         }
     }
 
+    private fun emitThrottled(snapshot: DictionaryProgressModel.Snapshot) {
+        val now = SystemClock.elapsedRealtime()
+        val stageChanged = snapshot.titleRes != lastShownTitleRes
+        if (stageChanged || (now - lastEmitMs).milliseconds >= MIN_NOTIFICATION_INTERVAL) {
+            flushJob?.cancel()
+            pendingSnapshot = null
+            publish(snapshot, now)
+        } else {
+            pendingSnapshot = snapshot
+            if (flushJob?.isActive != true) {
+                flushJob = scope.launch(mainDispatcher) {
+                    delay(MIN_NOTIFICATION_INTERVAL - (now - lastEmitMs).milliseconds)
+                    pendingSnapshot?.let { publish(it, SystemClock.elapsedRealtime()) }
+                    pendingSnapshot = null
+                }
+            }
+        }
+    }
+
+    private fun publish(snapshot: DictionaryProgressModel.Snapshot, now: Long) {
+        if (terminalActive) return
+        lastShownTitleRes = snapshot.titleRes
+        lastEmitMs = now
+        notifications.showProgress(snapshot.percent, snapshot.titleRes)
+    }
+
+    private fun resetThrottle() {
+        flushJob?.cancel()
+        pendingSnapshot = null
+        lastShownTitleRes = 0
+        lastEmitMs = 0L
+    }
+
     fun beginFlow() {
         terminalActive = false
+        resetThrottle()
         notifications.cancelTerminalNotification()
     }
 
@@ -52,6 +101,7 @@ class DictionaryProgressPresenter(
 
     override fun cancelProgress() {
         terminalActive = false
+        resetThrottle()
         notifications.cancelProgressNotification()
     }
 }

app/src/main/java/com/example/research/common/ui/components/BadgedIcon.kt

@@ -0,0 +1,46 @@
+package com.example.research.common.ui.components
+
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.offset
+import androidx.compose.foundation.layout.size
+import androidx.compose.material3.Badge
+import androidx.compose.material3.Icon
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.painter.Painter
+import androidx.compose.ui.platform.testTag
+import androidx.compose.ui.semantics.contentDescription
+import androidx.compose.ui.semantics.semantics
+import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.dp
+
+private val BadgeOutset = 4.dp
+
+@Composable
+fun BadgedIcon(
+    painter: Painter,
+    tint: Color,
+    size: Dp,
+    badgeDescription: String?,
+    modifier: Modifier = Modifier,
+) {
+    Box(modifier = modifier.size(size)) {
+        Icon(
+            painter = painter,
+            contentDescription = null,
+            tint = tint,
+            modifier = Modifier.size(size)
+        )
+        if (badgeDescription != null) {
+            Badge(
+                modifier = Modifier
+                    .align(Alignment.TopEnd)
+                    .offset(x = BadgeOutset, y = -BadgeOutset)
+                    .testTag("badge")
+                    .semantics { contentDescription = badgeDescription }
+            )
+        }
+    }
+}

app/src/main/java/com/example/research/common/ui/components/CollapsibleHeader.kt

@@ -5,7 +5,6 @@ import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
-import androidx.compose.foundation.layout.size
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
@@ -29,7 +28,8 @@ fun CollapsibleHeader(
     onToggle: () -> Unit,
     modifier: Modifier = Modifier,
     subtitle: String? = null,
-    testTag: String? = null
+    testTag: String? = null,
+    badgeDescription: String? = null,
 ) {
     Row(
         modifier = modifier
@@ -43,11 +43,11 @@ fun CollapsibleHeader(
         verticalAlignment = Alignment.CenterVertically,
         horizontalArrangement = Arrangement.spacedBy(12.dp)
     ) {
-        Icon(
+        BadgedIcon(
             painter = painterResource(iconRes),
-            contentDescription = null,
             tint = MaterialTheme.colorScheme.primary,
-            modifier = Modifier.size(24.dp)
+            size = 24.dp,
+            badgeDescription = badgeDescription,
         )
 
         Column(

app/src/main/java/com/example/research/core/util/NaturalSort.kt

@@ -0,0 +1,128 @@
+package com.example.research.core.util
+
+val NaturalStringComparator: Comparator<String> = Comparator { a, b -> compareNatural(a, b) }
+
+private const val NUMERAL_CAP = 1_000_000_000_000_000_000L
+
+private fun digitOf(c: Char): Int = when (c) {
+    '〇', '零' -> 0
+    '一', '壹', '壱', '弌' -> 1
+    '二', '貳', '贰', '弐', '弍', '兩', '两' -> 2
+    '三', '叁', '參', '参', '弎' -> 3
+    '四', '肆' -> 4
+    '五', '伍' -> 5
+    '六', '陸', '陆' -> 6
+    '七', '柒' -> 7
+    '八', '捌' -> 8
+    '九', '玖' -> 9
+    else -> Character.digit(c, 10)
+}
+
+private fun smallUnitOf(c: Char): Long = when (c) {
+    '十', '拾' -> 10L
+    '百', '佰' -> 100L
+    '千', '仟' -> 1000L
+    else -> 0L
+}
+
+private fun fixedTensOf(c: Char): Long = when (c) {
+    '廿' -> 20L
+    '卅' -> 30L
+    '卌' -> 40L
+    else -> 0L
+}
+
+private fun bigUnitOf(c: Char): Long = when (c) {
+    '万', '萬' -> 10_000L
+    '億', '亿' -> 100_000_000L
+    '兆' -> 1_000_000_000_000L
+    '京' -> 10_000_000_000_000_000L
+    else -> 0L
+}
+
+private fun isNumeralChar(c: Char): Boolean =
+    digitOf(c) >= 0 || smallUnitOf(c) > 0L || fixedTensOf(c) > 0L || bigUnitOf(c) > 0L
+
+private fun satMul(a: Long, b: Long): Long =
+    if (a != 0L && b > NUMERAL_CAP / a) NUMERAL_CAP else minOf(a * b, NUMERAL_CAP)
+
+private fun satAdd(a: Long, b: Long): Long = minOf(a + b, NUMERAL_CAP)
+
+private fun numeralValue(s: String, start: Int, end: Int): Long {
+    var total = 0L
+    var section = 0L
+    var pending = -1L
+    for (k in start until end) {
+        val c = s[k]
+        val digit = digitOf(c)
+        if (digit >= 0) {
+            pending = if (pending < 0) digit.toLong() else satAdd(satMul(pending, 10L), digit.toLong())
+            continue
+        }
+        val small = smallUnitOf(c)
+        if (small > 0L) {
+            section = satAdd(section, satMul(if (pending < 0) 1L else pending, small))
+            pending = -1
+            continue
+        }
+        val fixed = fixedTensOf(c)
+        if (fixed > 0L) {
+            section = satAdd(section, fixed)
+            pending = -1
+            continue
+        }
+        val base = satAdd(section, maxOf(pending, 0L))
+        total = satAdd(total, satMul(if (base == 0L) 1L else base, bigUnitOf(c)))
+        section = 0L
+        pending = -1
+    }
+    return satAdd(total, satAdd(section, maxOf(pending, 0L)))
+}
+
+private fun compareNatural(a: String, b: String): Int {
+    var i = 0
+    var j = 0
+    while (i < a.length && j < b.length) {
+        val ca = a[i]
+        val cb = b[j]
+        val asciiA = ca in '0'..'9'
+        val asciiB = cb in '0'..'9'
+        when {
+            !asciiA && !asciiB && isNumeralChar(ca) && isNumeralChar(cb) -> {
+                var endA = i
+                while (endA < a.length && isNumeralChar(a[endA])) endA++
+                var endB = j
+                while (endB < b.length && isNumeralChar(b[endB])) endB++
+                val diff = numeralValue(a, i, endA).compareTo(numeralValue(b, j, endB))
+                if (diff != 0) return diff
+                i = endA
+                j = endB
+            }
+            asciiA && asciiB -> {
+                var endA = i
+                while (endA < a.length && a[endA] in '0'..'9') endA++
+                var endB = j
+                while (endB < b.length && b[endB] in '0'..'9') endB++
+                var startA = i
+                while (startA < endA - 1 && a[startA] == '0') startA++
+                var startB = j
+                while (startB < endB - 1 && b[startB] == '0') startB++
+                val lengthA = endA - startA
+                val lengthB = endB - startB
+                if (lengthA != lengthB) return lengthA.compareTo(lengthB)
+                for (k in 0 until lengthA) {
+                    val diff = a[startA + k].compareTo(b[startB + k])
+                    if (diff != 0) return diff
+                }
+                i = endA
+                j = endB
+            }
+            else -> {
+                if (ca != cb) return ca.compareTo(cb)
+                i++
+                j++
+            }
+        }
+    }
+    return (a.length - i).compareTo(b.length - j)
+}

app/src/main/java/com/example/research/data/local/preferences/PreferencesManager.kt

@@ -2,14 +2,20 @@ package com.example.research.data.local.preferences
 
 import android.content.Context
 import androidx.datastore.core.DataStore
+import androidx.datastore.core.FileStorage
+import androidx.datastore.core.handlers.ReplaceFileCorruptionHandler
 import androidx.datastore.preferences.core.Preferences
+import androidx.datastore.preferences.core.PreferencesFileSerializer
 import androidx.datastore.preferences.core.edit
 import androidx.datastore.preferences.core.booleanPreferencesKey
+import androidx.datastore.preferences.core.emptyPreferences
 import androidx.datastore.preferences.core.stringPreferencesKey
 import androidx.datastore.preferences.core.stringSetPreferencesKey
-import androidx.datastore.preferences.preferencesDataStore
+import androidx.datastore.preferences.preferencesDataStoreFile
 import com.example.research.core.domain.model.DictionarySource
 import com.example.research.core.domain.model.SearchBarPosition
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.SupervisorJob
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.distinctUntilChanged
 import kotlinx.coroutines.flow.first
@@ -17,7 +23,23 @@ import kotlinx.coroutines.flow.map
 import kotlinx.serialization.json.Json
 import java.io.File
 
-private val Context.dataStore: DataStore<Preferences> by preferencesDataStore(name = "settings")
+private const val SETTINGS_STORE_NAME = "settings"
+
+private val storeLock = Any()
+
+@Volatile
+private var settingsStore: DataStore<Preferences>? = null
+
+private val Context.dataStore: DataStore<Preferences>
+    get() = settingsStore ?: synchronized(storeLock) {
+        settingsStore ?: DataStore.Builder(
+            storage = FileStorage(PreferencesFileSerializer) {
+                applicationContext.preferencesDataStoreFile(SETTINGS_STORE_NAME)
+            },
+            context = Dispatchers.IO + SupervisorJob(),
+        ).setCorruptionHandler(ReplaceFileCorruptionHandler { emptyPreferences() }).build()
+            .also { settingsStore = it }
+    }
 
 data class SectionExpansionStates(
     val isThemeExpanded: Boolean = false,

app/src/main/java/com/example/research/data/paging/IndexEntryPagingSource.kt

@@ -5,59 +5,26 @@ import androidx.paging.PagingState
 import com.example.research.core.domain.model.Dictionary
 import com.example.research.core.domain.model.IndexEntry
 import com.example.research.core.performance.ReSearchTrace
-import com.example.research.core.util.sanitizeQuery
 import com.example.research.data.parser.IndexSearcher
-import com.example.research.data.parser.SearchRankingContext
-import com.example.research.data.parser.rankBySearchRelevance
+import com.example.research.data.parser.sortByCharCountThenNatural
+
 import kotlinx.coroutines.async
 import kotlinx.coroutines.awaitAll
 import kotlinx.coroutines.coroutineScope
 import kotlinx.coroutines.CancellationException
 import java.io.File
 
-/**
- * Two-phase search paging.
- *
- * Page one (key = null) is the ranked head: the capped, relevance-ordered result the
- * search screen has always shown, merged across active dictionaries. Every range scan
- * that hit its cap hands back a [IndexSearcher.RangeCursor]; those become the tail key.
- *
- * Tail pages continue the unfinished range scans directly from the index files and
- * merge them alphabetically (k-way, by index word), so scrolling eventually surfaces
- * every prefix match in every active dictionary. Articles already shown -- by the head
- * or by an earlier tail page, including diacritic alias duplicates -- are filtered
- * through [emittedArticles], which grows only as far as the user actually scrolls.
- *
- * A new query builds a new PagingSource (see SearchViewModel's flatMapLatest), so an
- * in-flight head or tail load is cancelled by Paging when the user keeps typing.
- */
 class IndexEntryPagingSource(
     private val indexSearcher: IndexSearcher,
-    private val dictionaries: List<Dictionary>,
+    dictionaries: List<Dictionary>,
     private val query: String
-) : PagingSource<IndexEntryPagingSource.TailKey, IndexEntry>() {
+) : PagingSource<Int, IndexEntry>() {
 
-    data class StreamCursor(
-        val dictPosition: Int,
-        val cursor: IndexSearcher.RangeCursor
-    )
+    private val activeDictionaries = dictionaries.filter { it.isActive }
 
-    data class TailKey(val streams: List<StreamCursor>)
-
-    private data class EmittedKey(
-        val dictPosition: Int,
-        val word: String,
-        val offset: Long
-    )
-
-    private val emittedArticles = HashSet<EmittedKey>()
-
-    private val activeDictionaries = dictionaries.withIndex().filter { it.value.isActive }
-
-    override suspend fun load(params: LoadParams<TailKey>): LoadResult<TailKey, IndexEntry> {
+    override suspend fun load(params: LoadParams<Int>): LoadResult<Int, IndexEntry> {
         return try {
-            val key = params.key
-            if (key == null) loadHead() else loadTail(key, params.loadSize)
+            loadAll()
         } catch (e: CancellationException) {
             throw e
         } catch (e: Exception) {
@@ -65,21 +32,22 @@ class IndexEntryPagingSource(
         }
     }
 
-    private suspend fun loadHead(): LoadResult<TailKey, IndexEntry> =
+    private suspend fun loadAll(): LoadResult<Int, IndexEntry> =
         ReSearchTrace.asyncSection(ReSearchTrace.SEARCH_PAGING) {
             coroutineScope {
                 val perDictionary = activeDictionaries
-                    .map { (position, dict) ->
+                    .map { dict ->
                         async {
                             val indexFile = File(dict.indexPath)
                             if (!indexFile.exists()) return@async null
 
                             try {
-                                val result = indexSearcher.searchWithCursors(
+                                val entries = indexSearcher.search(
                                     pathOrUri = indexFile.absolutePath,
-                                    query = query
+                                    query = query,
+                                    includeSubstringMatches = false
                                 )
-                                Triple(position, dict, result)
+                                dict to entries
                             } catch (e: CancellationException) {
                                 throw e
                             } catch (_: Exception) {
@@ -90,105 +58,28 @@ class IndexEntryPagingSource(
                     .awaitAll()
                     .filterNotNull()
 
-                val rawResults = perDictionary.flatMap { (position, dict, result) ->
-                    result.entries.map { entry ->
-                        position to entry.withDictionary(
+                val rawResults = perDictionary.flatMap { (dict, entries) ->
+                    entries.map { entry ->
+                        entry.withDictionary(
                             dict.metadata.name.ifBlank { dict.name },
                             dict.path
                         )
                     }
                 }
 
-                val normalizedQuery = query.sanitizeQuery().lowercase().trim()
-                val ranked = rawResults.map { it.second }
-                    .rankBySearchRelevance(SearchRankingContext(normalizedQuery))
+                val ranked = rawResults
+                    .sortByCharCountThenNatural()
                     .distinctBy { Triple(it.dictionaryPath, it.word, it.offset.value) }
 
-                rawResults.forEach { (position, entry) -> emittedArticles.add(entry.emittedKey(position)) }
-
-                val streams = perDictionary.flatMap { (position, _, result) ->
-                    result.cursors.map { StreamCursor(position, it) }
-                }
                 LoadResult.Page(
                     data = ranked,
                     prevKey = null,
-                    nextKey = if (streams.isEmpty()) null else TailKey(streams)
+                    nextKey = null
                 )
             }
         }
 
-    private suspend fun loadTail(key: TailKey, loadSize: Int): LoadResult<TailKey, IndexEntry> {
-        val streams = key.streams.map { TailStream(it.dictPosition, it.cursor) }
-        val page = ArrayList<IndexEntry>(loadSize)
-        val pageKeys = HashSet<EmittedKey>()
-        val chunkSize = maxOf(loadSize, MIN_CHUNK)
-
-        while (page.size < loadSize) {
-            streams.forEach { it.ensureBuffered(chunkSize) }
-            val next = streams
-                .filter { it.hasBuffered }
-                .minByOrNull { it.peekWord }
-                ?: break
-
-            val scanned = next.consume()
-            val dict = dictionaries[next.dictPosition]
-            val entry = scanned.entry.withDictionary(
-                dict.metadata.name.ifBlank { dict.name },
-                dict.path
-            )
-            val emittedKey = entry.emittedKey(next.dictPosition)
-            if (emittedKey !in emittedArticles && pageKeys.add(emittedKey)) {
-                page.add(entry)
-            }
-        }
-
-        emittedArticles.addAll(pageKeys)
-
-        val remaining = streams.mapNotNull { stream ->
-            stream.nextCursor?.let { StreamCursor(stream.dictPosition, it) }
-        }
-        return LoadResult.Page(
-            data = page,
-            prevKey = null,
-            nextKey = if (remaining.isEmpty()) null else TailKey(remaining)
-        )
-    }
-
-    private inner class TailStream(
-        val dictPosition: Int,
-        initialCursor: IndexSearcher.RangeCursor
-    ) {
-        var nextCursor: IndexSearcher.RangeCursor? = initialCursor
-            private set
-        private var buffer: List<IndexSearcher.ScannedEntry> = emptyList()
-        private var position = 0
-
-        val hasBuffered: Boolean get() = position < buffer.size
-        val peekWord: String get() = buffer[position].entry.word
-
-        suspend fun ensureBuffered(chunkSize: Int) {
-            if (hasBuffered) return
-            val cursor = nextCursor ?: return
-            val indexPath = File(dictionaries[dictPosition].indexPath).absolutePath
-            buffer = indexSearcher.scanTailChunk(indexPath, cursor, chunkSize)
-            position = 0
-            if (buffer.isEmpty()) nextCursor = null
-        }
-
-        fun consume(): IndexSearcher.ScannedEntry {
-            val scanned = buffer[position]
-            position++
-            nextCursor = scanned.cursorAfter
-            return scanned
-        }
-    }
-
-    private fun IndexEntry.emittedKey(dictPosition: Int) =
-        EmittedKey(dictPosition, word, offset.value)
-
-    override fun getRefreshKey(state: PagingState<TailKey, IndexEntry>): TailKey? {
+    override fun getRefreshKey(state: PagingState<Int, IndexEntry>): Int? {
         return null
     }
 }
-
-private const val MIN_CHUNK = 48

app/src/main/java/com/example/research/data/parser/DslIndexer.kt

@@ -49,6 +49,7 @@ class DslIndexer(context: Context? = null) {
     suspend fun createIndex(
         dslInputStream: java.io.InputStream,
         indexFile: File,
+        totalInputBytes: Long = -1L,
         onProgress: (Int) -> Unit = {},
         onOperationChange: (String) -> Unit = {},
         onFileProgress: (Float) -> Unit = {},
@@ -65,7 +66,7 @@ class DslIndexer(context: Context? = null) {
             try { foldedIndexFile(indexFile).delete() } catch (_: Throwable) { /* Legacy v5 leftover */ }
             onOperationChange("Parsing file")
             onFileProgress(0.0f)
-            counts = parseDslToTempFile(bufferedStream, tempFile,
+            counts = parseDslToTempFile(bufferedStream, tempFile, totalInputBytes,
                 onProgress, onFileProgress, onCharsetDetected)
             onFileProgress(0.5f)
             onOperationChange("Sorting index")
@@ -88,6 +89,7 @@ class DslIndexer(context: Context? = null) {
     private suspend fun parseDslToTempFile(
         inputStream: java.io.InputStream,
         tempFile: File,
+        totalInputBytes: Long,
         onProgress: (Int) -> Unit,
         onFileProgress: (Float) -> Unit = {},
         onCharsetDetected: (DslCharsetDetector.DetectedCharset) -> Unit = {}
@@ -230,8 +232,12 @@ class DslIndexer(context: Context? = null) {
                     val yieldThreshold = adaptiveConfig.yieldInterval
                     if (yieldCounter >= yieldThreshold) {
                         onProgress(entryCount)
-                        val estimatedProgress = (lineCount * 10).toFloat() / (Int.MAX_VALUE / 1000)
-                        onFileProgress(estimatedProgress.coerceIn(0f, 0.4f))
+                        val parseProgress = if (totalInputBytes > 0L) {
+                            (reader.position.toFloat() / totalInputBytes.toFloat())
+                        } else {
+                            (lineCount * 10).toFloat() / (Int.MAX_VALUE / 1000)
+                        }
+                        onFileProgress(parseProgress.coerceIn(0f, 0.4f))
 
                         if (resourceManager != null) {
                             if (resourceManager.shouldYield(adaptiveConfig)) {

app/src/main/java/com/example/research/data/parser/IndexSearcher.kt

@@ -18,6 +18,7 @@ import kotlinx.coroutines.yield
 import java.io.BufferedInputStream
 import java.io.Closeable
 import java.io.DataInputStream
+import java.io.EOFException
 import java.io.File
 import java.io.FileInputStream
 import java.io.RandomAccessFile
@@ -25,7 +26,6 @@ import java.io.RandomAccessFile
 class IndexSearcher(private val context: Context) {
     private val metadataCache = MetadataLruCache(maxBytes = 64L * 1024L * 1024L)
     private val resultsCache = ResultsLruCache<List<IndexEntry>>(maxEntries = 20)
-    private val cursorResultsCache = ResultsLruCache<CursorSearchResult>(maxEntries = 20)
 
     /**
      * Pre-allocated reusable buffer for readEntry() to reduce allocations.
@@ -45,27 +45,6 @@ class IndexSearcher(private val context: Context) {
         val dataStartOffset: Long
     )
 
-    data class RangeCursor(
-        val rangeQuery: String,
-        val absoluteIndex: Int,
-        val fileOffset: Long
-    )
-
-    internal class RangeScanResult(
-        val entries: List<IndexEntry>,
-        val nextCursor: RangeCursor?
-    )
-
-    class CursorSearchResult(
-        val entries: List<IndexEntry>,
-        val cursors: List<RangeCursor>
-    )
-
-    class ScannedEntry(
-        val entry: IndexEntry,
-        val cursorAfter: RangeCursor?
-    )
-
     suspend fun findFirstEntry(pathOrUri: String, query: String): IndexEntry? = withContext(Dispatchers.Default) {
         val normalizedQuery = query.sanitizeQuery().lowercase().trim()
         try {
@@ -109,7 +88,7 @@ class IndexSearcher(private val context: Context) {
         }
         val normalizedQuery = query.sanitizeQuery().lowercase().trim()
         val foldedQuery = normalizedQuery.foldLatinDiacritics()
-        val cacheKey = "$pathOrUri:${normalizedQuery.sanitizeCacheKey()}"
+        val cacheKey = "$pathOrUri:$includeSubstringMatches:${normalizedQuery.sanitizeCacheKey()}"
         resultsCache.get(cacheKey)?.let {
             return@withContext it
         }
@@ -118,9 +97,9 @@ class IndexSearcher(private val context: Context) {
             val count = metadata.totalCount
             if (count == 0) return@withContext emptyList()
             val results = openSource(pathOrUri).use { source ->
-                val prefixMatches = readPrefixMatches(source, metadata, normalizedQuery).entries.toMutableList()
+                val prefixMatches = readPrefixMatches(source, metadata, normalizedQuery).toMutableList()
                 if (foldedQuery != normalizedQuery) {
-                    prefixMatches.addAll(readPrefixMatches(source, metadata, foldedQuery).entries)
+                    prefixMatches.addAll(readPrefixMatches(source, metadata, foldedQuery))
                 }
 
                 val substringMatches = mutableListOf<IndexEntry>()
@@ -143,9 +122,7 @@ class IndexSearcher(private val context: Context) {
                         }
                     }
                 }
-                (prefixMatches + substringMatches)
-                    .rankBySearchRelevance(SearchRankingContext(normalizedQuery, foldedQuery))
-                    .distinctBy { it.articleKey() }
+                (prefixMatches + substringMatches).distinctBy { it.articleKey() }
             }
             resultsCache.put(cacheKey, results)
             results
@@ -165,81 +142,9 @@ class IndexSearcher(private val context: Context) {
         metadataCache.getOrPut(pathOrUri) { loadMetadata(pathOrUri) }
     }
 
-    suspend fun searchWithCursors(
-        pathOrUri: String,
-        query: String
-    ): CursorSearchResult = withContext(Dispatchers.Default) {
-        if (query.isBlank()) {
-            return@withContext CursorSearchResult(emptyList(), emptyList())
-        }
-        val normalizedQuery = query.sanitizeQuery().lowercase().trim()
-        val foldedQuery = normalizedQuery.foldLatinDiacritics()
-        val cacheKey = "$pathOrUri:${normalizedQuery.sanitizeCacheKey()}"
-        cursorResultsCache.get(cacheKey)?.let {
-            return@withContext it
-        }
-        try {
-            val metadata = metadataCache.getOrPut(pathOrUri) { loadMetadata(pathOrUri) }
-            if (metadata.totalCount == 0) {
-                return@withContext CursorSearchResult(emptyList(), emptyList())
-            }
-            val result = openSource(pathOrUri).use { source ->
-                val scans = buildList {
-                    add(readPrefixMatches(source, metadata, normalizedQuery))
-                    if (foldedQuery != normalizedQuery) {
-                        add(readPrefixMatches(source, metadata, foldedQuery))
-                    }
-                }
-                val entries = scans.flatMap { it.entries }
-                    .rankBySearchRelevance(SearchRankingContext(normalizedQuery, foldedQuery))
-                    .distinctBy { it.articleKey() }
-                CursorSearchResult(entries, scans.mapNotNull { it.nextCursor })
-            }
-            cursorResultsCache.put(cacheKey, result)
-            result
-        } catch (e: CancellationException) {
-            throw e
-        } catch (e: Exception) {
-            Log.e(TAG, "searchWithCursors() - error: ${e.message}", e)
-            if (e is DictionaryError) throw e
-            throw DictionaryError.SearchError.QueryFailed(context.getString(R.string.error_search_failed, query.take(20), pathOrUri.take(20)), e)
-        }
-    }
-
-    suspend fun scanTailChunk(
-        pathOrUri: String,
-        cursor: RangeCursor,
-        maxEntries: Int
-    ): List<ScannedEntry> = withContext(Dispatchers.Default) {
-        val metadata = metadataCache.getOrPut(pathOrUri) { loadMetadata(pathOrUri) }
-        if (cursor.absoluteIndex >= metadata.totalCount) return@withContext emptyList()
-        openSource(pathOrUri).use { source ->
-            source.seek(cursor.fileOffset)
-            val out = ArrayList<ScannedEntry>(maxEntries)
-            var currentIdx = cursor.absoluteIndex
-            var iterationCount = 0
-            while (currentIdx < metadata.totalCount && out.size < maxEntries) {
-                if (iterationCount % 1000 == 0) yield()
-                val entry = readEntry(source, metadata)
-                val entryWordLower = entry.word.lowercase()
-                if (!entryWordLower.startsWith(cursor.rangeQuery)) break
-                currentIdx++
-                iterationCount++
-                val cursorAfter = if (currentIdx < metadata.totalCount) {
-                    RangeCursor(cursor.rangeQuery, currentIdx, source.position())
-                } else {
-                    null
-                }
-                out.add(ScannedEntry(entry.copy(word = entryWordLower), cursorAfter))
-            }
-            out
-        }
-    }
-
     fun trimMemory(level: Int) {
         metadataCache.trim(level)
         resultsCache.trim(level)
-        cursorResultsCache.trim(level)
     }
 
     suspend fun isMetadataLoaded(pathOrUri: String): Boolean {
@@ -349,9 +254,9 @@ class IndexSearcher(private val context: Context) {
         source: RandomAccessSource,
         metadata: IndexMetadata,
         query: String
-    ): RangeScanResult {
+    ): List<IndexEntry> {
         val firstMatch = findFirstMatch(source, metadata, query)
-            ?: return RangeScanResult(emptyList(), null)
+            ?: return emptyList()
         return readMatchingEntries(source, metadata, firstMatch, query)
     }
 
@@ -415,26 +320,21 @@ class IndexSearcher(private val context: Context) {
         metadata: IndexMetadata,
         firstMatch: Pair<Int, IndexEntry>,
         query: String
-    ): RangeScanResult {
+    ): List<IndexEntry> {
         val results = mutableListOf<IndexEntry>()
         results.add(firstMatch.second)
-        val uniqueArticles = hashSetOf(firstMatch.second.articleKey())
         var currentIdx = firstMatch.first + 1
         var iterationCount = 0
         while (currentIdx < metadata.totalCount) {
-            if (uniqueArticles.size >= MAX_PREFIX_RESULTS) {
-                return RangeScanResult(results, RangeCursor(query, currentIdx, source.position()))
-            }
             if (iterationCount % 1000 == 0) yield()
             val entry = readEntry(source, metadata)
             val entryWordLower = entry.word.lowercase()
             if (!entryWordLower.startsWith(query)) break
-            uniqueArticles.add(entry.articleKey())
             results.add(entry.copy(word = entryWordLower))
             currentIdx++
             iterationCount++
         }
-        return RangeScanResult(results, null)
+        return results
     }
 
     private fun readPooledString(source: RandomAccessSource, length: Int): String {
@@ -483,7 +383,6 @@ class IndexSearcher(private val context: Context) {
         private const val TAG = "IndexSearcher"
         private const val SUBSTRING_SCAN_MAX_ENTRIES = 200_000
         private const val SPARSE_INTERVAL_V1 = 128
-        private const val MAX_PREFIX_RESULTS = 200
         private const val MAX_SUBSTRING_RESULTS = 100
     }
 }
@@ -588,30 +487,89 @@ interface RandomAccessSource : Closeable {
 }
 class FileSource(file: File) : RandomAccessSource {
     private val raf = RandomAccessFile(file, "r")
+    private val buffer = ByteArray(BUFFER_SIZE)
+    private var bufferStart = 0L
+    private var bufferEnd = 0L
+    private var pos = 0L
 
     override fun seek(pos: Long) {
-        raf.seek(pos)
+        this.pos = pos
     }
 
-    override fun position(): Long = raf.filePointer
+    override fun position(): Long = pos
 
-    override fun readUnsignedByte(): Int = raf.readUnsignedByte()
+    private fun refill(minNeeded: Int): Boolean {
+        if (bufferEnd - pos >= minNeeded) return true
+        bufferStart = pos
+        raf.seek(pos)
+        val read = raf.read(buffer)
+        bufferEnd = bufferStart + maxOf(read, 0)
+        return bufferEnd - pos >= minNeeded
+    }
 
-    override fun readUnsignedShort(): Int = raf.readUnsignedShort()
+    override fun readUnsignedByte(): Int {
+        if (!refill(1)) throw EOFException()
+        return buffer[(pos++ - bufferStart).toInt()].toInt() and 0xFF
+    }
 
-    override fun readInt(): Int = raf.readInt()
+    override fun readUnsignedShort(): Int {
+        if (!refill(2)) throw EOFException()
+        val i = (pos - bufferStart).toInt()
+        pos += 2
+        return (buffer[i].toInt() and 0xFF shl 8) or (buffer[i + 1].toInt() and 0xFF)
+    }
 
-    override fun readLong(): Long = raf.readLong()
+    override fun readInt(): Int {
+        if (!refill(4)) throw EOFException()
+        val i = (pos - bufferStart).toInt()
+        pos += 4
+        return (buffer[i].toInt() shl 24) or
+            (buffer[i + 1].toInt() and 0xFF shl 16) or
+            (buffer[i + 2].toInt() and 0xFF shl 8) or
+            (buffer[i + 3].toInt() and 0xFF)
+    }
+
+    override fun readLong(): Long {
+        if (!refill(8)) throw EOFException()
+        val i = (pos - bufferStart).toInt()
+        pos += 8
+        var value = 0L
+        for (k in 0 until 8) {
+            value = (value shl 8) or (buffer[i + k].toLong() and 0xFF)
+        }
+        return value
+    }
 
     override fun readFully(b: ByteArray) {
-        raf.readFully(b)
+        readFully(b, 0, b.size)
     }
 
     override fun readFully(b: ByteArray, off: Int, len: Int) {
+        if (len > BUFFER_SIZE / 2) {
+            raf.seek(pos)
             raf.readFully(b, off, len)
+            pos += len
+            bufferEnd = bufferStart
+            return
+        }
+        var remaining = len
+        var dst = off
+        while (remaining > 0) {
+            if (!refill(1)) throw EOFException()
+            val i = (pos - bufferStart).toInt()
+            val chunk = minOf(remaining, (bufferEnd - pos).toInt())
+            System.arraycopy(buffer, i, b, dst, chunk)
+            pos += chunk
+            dst += chunk
+            remaining -= chunk
+        }
     }
 
     override fun close() {
         raf.close()
     }
+
+    private companion object {
+        private const val BUFFER_SIZE = 64 * 1024
+    }
 }

app/src/main/java/com/example/research/data/parser/SearchRanking.kt

@@ -1,45 +1,38 @@
 package com.example.research.data.parser
 
 import com.example.research.core.domain.model.IndexEntry
-import com.example.research.core.util.foldLatinDiacritics
+import com.example.research.core.util.NaturalStringComparator
 
-internal data class SearchRankingContext(
-    val normalizedQuery: String,
-    val foldedQuery: String = normalizedQuery.foldLatinDiacritics(),
-)
-
-private data class SortKey(
-    val matchTier: Int,
-    val exactMatch: Int,
-    val charCount: Int,
-    val word: String,
-    val entry: IndexEntry,
-)
-
-internal fun List<IndexEntry>.rankBySearchRelevance(
-    ranking: SearchRankingContext
-): List<IndexEntry> {
+internal fun List<IndexEntry>.sortByCharCountThenNatural(): List<IndexEntry> {
     if (size < 2) return this
 
-    return map { entry ->
-        val word = entry.word
+    val charCounts = IntArray(size)
+    var minCount = Int.MAX_VALUE
+    var maxCount = Int.MIN_VALUE
+    for (i in indices) {
+        val entry = this[i]
         val displayKey = entry.originalWord
             .trim()
             .ifEmpty { entry.word.trim() }
+        val count = displayKey.codePointCount(0, displayKey.length)
+        charCounts[i] = count
+        if (count < minCount) minCount = count
+        if (count > maxCount) maxCount = count
+    }
 
-        SortKey(
-            matchTier = when {
-                !entry.isAlias && word.startsWith(ranking.normalizedQuery) -> 0
-                entry.isAlias && word.startsWith(ranking.foldedQuery) -> 1
-                !entry.isAlias && word.foldLatinDiacritics().startsWith(ranking.foldedQuery) -> 1
-                else -> 2
-            },
-            exactMatch = if (word == ranking.normalizedQuery) 0 else 1,
-            charCount = displayKey.codePointCount(0, displayKey.length),
-            word = word,
-            entry = entry,
-        )
+    val buckets = arrayOfNulls<ArrayList<IndexEntry>>(maxCount - minCount + 1)
+    for (i in indices) {
+        val bucketIndex = charCounts[i] - minCount
+        (buckets[bucketIndex] ?: ArrayList<IndexEntry>().also { buckets[bucketIndex] = it })
+            .add(this[i])
     }
-        .sortedWith(compareBy({ it.matchTier }, { it.exactMatch }, { it.charCount }, { it.word }))
-        .map { it.entry }
+
+    val naturalOrder = compareBy<IndexEntry, String>(NaturalStringComparator) { it.word }
+    val result = ArrayList<IndexEntry>(size)
+    for (bucket in buckets) {
+        if (bucket == null) continue
+        if (bucket.size > 1) bucket.sortWith(naturalOrder)
+        result.addAll(bucket)
+    }
+    return result
 }

app/src/main/java/com/example/research/data/repository/KotlinDictionaryEngine.kt

@@ -22,6 +22,7 @@ import java.io.BufferedInputStream
 import java.io.File
 import java.io.FileInputStream
 import java.io.InputStream
+import java.io.RandomAccessFile
 import java.util.concurrent.CancellationException
 import java.util.zip.GZIPInputStream
 
@@ -51,12 +52,14 @@ class KotlinDictionaryEngine(private val context: Context) : ProgressIndexingEng
 
             val indexFile = File(indexPath)
             val metadata = readMetadata(dictPath)
+            val totalInputBytes = uncompressedInputLength(dictFile)
 
             val articleCount = withContext(Dispatchers.IO) {
                 openDslInputStream(dictPath).use { inputStream ->
                     dslIndexer.createIndex(
                         dslInputStream = inputStream,
                         indexFile = indexFile,
+                        totalInputBytes = totalInputBytes,
                         onProgress = { count ->
                             onArticlesIndexed(count)
                         },
@@ -207,6 +210,30 @@ class KotlinDictionaryEngine(private val context: Context) : ProgressIndexingEng
         }
     }
 
+    private fun uncompressedInputLength(file: File): Long {
+        val name = file.name.lowercase()
+        if (!name.endsWith(".dz") && !name.endsWith(".gz")) return file.length()
+        return readGzipUncompressedLength(file).takeIf { it > 0L } ?: file.length()
+    }
+
+    private fun readGzipUncompressedLength(file: File): Long = try {
+        RandomAccessFile(file, "r").use { raf ->
+            val fileLength = raf.length()
+            if (fileLength < 18L) {
+                -1L
+            } else {
+                raf.seek(fileLength - 4L)
+                val b0 = raf.readUnsignedByte()
+                val b1 = raf.readUnsignedByte()
+                val b2 = raf.readUnsignedByte()
+                val b3 = raf.readUnsignedByte()
+                (b0 or (b1 shl 8) or (b2 shl 16) or (b3 shl 24)).toLong() and 0xFFFFFFFFL
+            }
+        }
+    } catch (_: Exception) {
+        -1L
+    }
+
     private fun resolveIndexPath(indexArg: String): String {
         val candidate = File(indexArg)
         if (candidate.exists()) return candidate.absolutePath

app/src/main/java/com/example/research/feature/download/DownloadManager.kt

@@ -52,11 +52,19 @@ class DownloadManager(
     var onDownloadSuccess: (() -> Unit)? = null
     var onTerminal: ((DownloadState) -> Unit)? = null
 
+    private suspend fun expireErrorStateToIdle() {
+        delay(TERMINAL_STATE_DURATION)
+        if (downloadState.value is DownloadState.Error) {
+            updateDownloadProgressState(DownloadState.Idle, 0f)
+        }
+    }
+
     fun startDownload() {
         if (downloadState.value is DownloadState.Loading) return
         if (!downloadScope.isActive) return
         onFlowStarted?.invoke()
         cancelCleanupJob = null
+        updateDownloadProgressState(DownloadState.Loading, 0f)
         downloadJob = downloadScope.launch {
             mutex.withLock {
                 try {
@@ -78,11 +86,10 @@ class DownloadManager(
                         updateDownloadProgressState(
                             DownloadState.Error(sourceUnavailableMessage), 0f
                         )
+                        expireErrorStateToIdle()
                         return@withLock
                     }
 
-                    updateDownloadProgressState(DownloadState.Loading, 0f)
-
                     var lastReportedProgressBucket = -1
                     val result = ReSearchTrace.asyncSection(ReSearchTrace.DICTIONARY_DOWNLOAD) {
                         dictionaryRepository.downloadSources(downloadableSources) { progress ->
@@ -136,6 +143,7 @@ class DownloadManager(
                             }
 
                         }
+                        expireErrorStateToIdle()
                     }
                 } finally {
                     downloadJob = null
@@ -149,6 +157,7 @@ class DownloadManager(
         if (!downloadScope.isActive) return
         onFlowStarted?.invoke()
         cancelCleanupJob = null
+        updateDownloadProgressState(DownloadState.Loading, 0f)
         downloadJob = downloadScope.launch {
             mutex.withLock {
                 try {
@@ -174,11 +183,10 @@ class DownloadManager(
                         updateDownloadProgressState(
                             DownloadState.Error(sourceUnavailableMessage), 0f
                         )
+                        expireErrorStateToIdle()
                         return@withLock
                     }
 
-                    updateDownloadProgressState(DownloadState.Loading, 0f)
-
                     var lastReportedProgressBucket = -1
                     val result = ReSearchTrace.asyncSection(ReSearchTrace.DICTIONARY_DOWNLOAD) {
                         dictionaryRepository.downloadSources(downloadableSources) { progress ->
@@ -232,6 +240,7 @@ class DownloadManager(
                             }
 
                         }
+                        expireErrorStateToIdle()
                     }
                 } finally {
                     downloadJob = null

app/src/main/java/com/example/research/feature/download/repository/DictionaryChecker.kt

@@ -50,63 +50,36 @@ class DictionaryChecker(
         }
     }
 
-    suspend fun areDictionariesUpToDate(
+    suspend fun sourcesWithUpdates(
         folderUri: Uri,
         sources: List<DictionarySource>,
         files: List<DocumentFileInfo>? = null
-    ): Boolean = withContext(Dispatchers.IO) {
+    ): Set<String> = withContext(Dispatchers.IO) {
         try {
-            val enabledSources = sources.filter { it.isEnabled }
-            if (enabledSources.isEmpty()) {
-                return@withContext true
-            }
-
             val currentDate = DateUtils.getCurrentDateString()
             val previousDate = DateUtils.getPreviousDateString()
             val dictFiles = getDictFiles(folderUri, files)
-
-            val datedSources = enabledSources.filter { source ->
-                DictionarySource.hasDatePlaceholder(source.urlTemplate)
-            }
-            if (datedSources.isEmpty()) {
-                return@withContext true
-            }
-
-            val allHaveToday = datedSources.all { source ->
-                dictFiles.hasFileForSource(source, currentDate)
-            }
-
-            if (allHaveToday) {
-                return@withContext true
-            }
-
-            val allHaveYesterday = datedSources.all { source ->
-                dictFiles.hasFileForSource(source, previousDate)
-            }
-
-            if (allHaveYesterday) {
-                val serverHasToday = datedSources.any { source ->
+            sources
+                .filter { it.isEnabled && DictionarySource.hasDatePlaceholder(it.urlTemplate) }
+                .filter { source ->
+                    when {
+                        dictFiles.hasFileForSource(source, currentDate) -> false
+                        dictFiles.hasFileForSource(source, previousDate) ->
                             isSourceAvailableOnServer(source, currentDate)
-                }
-
-                return@withContext !serverHasToday
-            }
-
-            val serverCanOfferNewer = datedSources.any { source ->
-                when (probeSource(source, currentDate)) {
+                        else -> when (probeSource(source, currentDate)) {
                             SourceAvailability.AVAILABLE -> true
                             SourceAvailability.NOT_FOUND ->
                                 probeSource(source, previousDate) == SourceAvailability.AVAILABLE
                             SourceAvailability.UNKNOWN -> false
                         }
                     }
-
-            return@withContext !serverCanOfferNewer
+                }
+                .mapTo(mutableSetOf(), DictionarySource::id)
         } catch (e: CancellationException) {
             throw e
         } catch (e: Exception) {
             Log.e(TAG, "Error checking currency: ${e.message}", e)
-            true
+            emptySet()
         }
     }
 

app/src/main/java/com/example/research/feature/download/repository/DictionaryRepository.kt

@@ -25,21 +25,20 @@ class DictionaryRepository(
     private val extractor = DictionaryExtractor(context, fileStorageManager)
     private val cleaner = DictionaryCleaner(context, fileStorageManager)
 
-    private var filesBeforeDownload = mutableSetOf<String>()
-    private var downloadedPrefixes = mutableSetOf<String>()
+    private class DownloadSession(val filesBefore: Set<String>, val prefixes: Set<String>)
+
+    @Volatile
+    private var session: DownloadSession? = null
 
     companion object {
         private const val TAG = "DictionaryRepository"
     }
 
-    suspend fun areDictionariesUpToDate(
-        sources: List<DictionarySource>? = null
-    ): Boolean = withContext(Dispatchers.IO) {
-        val folderUri = preferencesManager.dictionaryPath
-        val uri = Uri.fromFile(File(folderUri))
-        val files = fileStorageManager.listFilesInFolder(uri)
-        val sourcesToCheck = sources ?: preferencesManager.dictionarySources.first()
-        checker.areDictionariesUpToDate(uri, sourcesToCheck, files)
+    suspend fun sourcesWithUpdates(
+        sources: List<DictionarySource>
+    ): Set<String> = withContext(Dispatchers.IO) {
+        val uri = Uri.fromFile(File(preferencesManager.dictionaryPath))
+        checker.sourcesWithUpdates(uri, sources, fileStorageManager.listFilesInFolder(uri))
     }
 
     suspend fun getEnabledSources(sourceUrls: List<String>? = null): List<DictionarySource> =
@@ -81,15 +80,10 @@ class DictionaryRepository(
         val files = fileStorageManager.listFilesInFolder(uri)
         cleaner.deleteCorruptedArchives(uri, files)
 
-        synchronized(filesBeforeDownload) {
-            filesBeforeDownload = files.map { it.name }.toMutableSet()
-        }
-
-        synchronized(downloadedPrefixes) {
-            downloadedPrefixes = sources.mapNotNull {
-                DictionarySource.extractPrefix(it.urlTemplate)
-            }.toMutableSet()
-        }
+        session = DownloadSession(
+            filesBefore = files.mapTo(mutableSetOf()) { it.name },
+            prefixes = sources.mapNotNullTo(mutableSetOf()) { DictionarySource.extractPrefix(it.urlTemplate) },
+        )
 
         downloader.downloadDictionaries(
             folderUri = uri,
@@ -114,63 +108,22 @@ class DictionaryRepository(
 
         cleaner.deleteUnprocessedFiles(uri, files)
 
-        val filesAfterStandardCleanup = fileStorageManager.listFilesInFolder(uri)
+        val current = session ?: return@withContext Result.success(Unit)
+        session = null
 
-        val existingFiles = synchronized(filesBeforeDownload) {
-            filesBeforeDownload.toSet()
+        fileStorageManager.listFilesInFolder(uri)
+            .filter { file ->
+                file.name !in current.filesBefore &&
+                    current.prefixes.any { prefix -> file.name.startsWith("${prefix}_") }
             }
-
-        val prefixes = synchronized(downloadedPrefixes) {
-            downloadedPrefixes.toSet()
-        }
-
-        val finalPrefixes = prefixes.ifEmpty {
-            val sources = preferencesManager.dictionarySources.first()
-            sources.mapNotNull { DictionarySource.extractPrefix(it.urlTemplate) }.toSet()
-        }
-
-        val filesToDelete = if (existingFiles.isEmpty()) {
-            filesAfterStandardCleanup.filter { file ->
-                val fileName = file.name
-                finalPrefixes.any { prefix -> fileName.startsWith("${prefix}_") }
-            }
-        } else {
-            filesAfterStandardCleanup.filter { file ->
-                file.name !in existingFiles &&
-                finalPrefixes.any { prefix -> file.name.startsWith("${prefix}_") }
-            }
-        }
-
-        if (filesToDelete.isNotEmpty()) {
-            var deletedCount = 0
-
-            for ((fileName, uri) in filesToDelete) {
-                val docFile = fileStorageManager.getDocumentFile(uri)
-                if (docFile != null && docFile.exists()) {
-                    val deleted = docFile.delete()
-                    if (deleted) {
-                        deletedCount++
-                    } else {
-                        val forceDeleted = fileStorageManager.forceDeleteFile(docFile, fileName)
-                        if (!forceDeleted) {
+            .forEach { (fileName, fileUri) ->
+                val docFile = fileStorageManager.getDocumentFile(fileUri)
+                if (docFile != null && docFile.exists() && !docFile.delete() &&
+                    !fileStorageManager.forceDeleteFile(docFile, fileName)
+                ) {
                     Log.e(TAG, "deleteUnprocessedFiles() - force delete failed for: $fileName")
-                        } else {
-                            deletedCount++
                 }
             }
-                }
-            }
-        }
-
-        synchronized(filesBeforeDownload) {
-            if (filesBeforeDownload.isNotEmpty()) {
-                filesBeforeDownload.clear()
-            }
-        }
-
-        synchronized(downloadedPrefixes) {
-            downloadedPrefixes.clear()
-        }
 
         Result.success(Unit)
     }
@@ -183,15 +136,7 @@ class DictionaryRepository(
         val prefixes = sources.mapNotNull { DictionarySource.extractPrefix(it.urlTemplate) }.toSet()
         
         val result = cleaner.performAllCleanup(uri, prefixes, files)
-
-        synchronized(filesBeforeDownload) {
-            filesBeforeDownload.clear()
-        }
-
-        synchronized(downloadedPrefixes) {
-            downloadedPrefixes.clear()
-        }
-
+        session = null
         result
     }
 }

app/src/main/java/com/example/research/feature/search/SearchViewModel.kt

@@ -14,8 +14,9 @@ import com.example.research.data.local.preferences.PreferencesManager
 import com.example.research.data.repository.LocalDictionaryRepository
 import com.example.research.ui.article.ArticleState
 import com.example.research.ui.article.ArticleTextWarmUp
-import com.example.research.ui.article.DslBlock
 import com.example.research.ui.article.DslAnnotatedParser
+import com.example.research.ui.article.HEAVY_ARTICLE_BLOCK_COUNT
+import com.example.research.ui.article.mergeDslBlocks
 import com.example.research.R
 import kotlinx.coroutines.*
 import kotlinx.coroutines.flow.*
@@ -63,7 +64,7 @@ class SearchViewModel(
     private var indexWarmupJob: Job? = null
     private var debounceSaveQueryJob: Job? = null
 
-    private val parseCache = java.util.LinkedHashMap<String, List<DslBlock>>(PARSE_CACHE_SIZE, 0.75f, true)
+    private val parseCache = java.util.LinkedHashMap<String, ArticleState.Success>(PARSE_CACHE_SIZE, 0.75f, true)
     private val articleHistory = ArrayDeque<ArticleState.Success>()
 
     private val activeDictionaries: StateFlow<List<com.example.research.core.domain.model.Dictionary>> =
@@ -111,9 +112,7 @@ class SearchViewModel(
             Pager(
                 config = PagingConfig(
                     pageSize = 12,
-                    prefetchDistance = 1,
-                    enablePlaceholders = false,
-                    initialLoadSize = 12
+                    enablePlaceholders = false
                 ),
                 pagingSourceFactory = {
                     IndexEntryPagingSource(
@@ -211,12 +210,7 @@ class SearchViewModel(
             val cached = synchronized(parseCache) { parseCache[cacheKey] }
             if (cached != null) {
                 mutableSelectedArticle.update {
-                    ArticleState.Success(
-                        title = entry.originalWord,
-                        dslContent = cached,
-                        dictionaryName = entry.dictionaryName,
-                        dictionaryPath = entry.dictionaryPath,
-                    )
+                    cached.copy(title = entry.originalWord, dictionaryName = entry.dictionaryName)
                 }
                 return@launch
             }
@@ -228,6 +222,13 @@ class SearchViewModel(
                             colorScheme = DslAnnotatedParser.ARTICLE_COLOR_SCHEME,
                         )
                     }
+                    val article = ArticleState.Success(
+                        title = entry.originalWord,
+                        dslContent = mergeDslBlocks(annotatedStringList),
+                        dictionaryName = entry.dictionaryName,
+                        dictionaryPath = entry.dictionaryPath,
+                        isHeavy = annotatedStringList.size > HEAVY_ARTICLE_BLOCK_COUNT,
+                    )
                     synchronized(parseCache) {
                         if (parseCache.size >= PARSE_CACHE_SIZE) {
                             val iterator = parseCache.entries.iterator()
@@ -235,19 +236,12 @@ class SearchViewModel(
                                 iterator.next().run { iterator.remove() }
                             }
                         }
-                        parseCache[cacheKey] = annotatedStringList
+                        parseCache[cacheKey] = article
                     }
                     viewModelScope.launch(Dispatchers.Default) {
-                        ArticleTextWarmUp.warmUp(getApplication(), annotatedStringList)
-                    }
-                    mutableSelectedArticle.update {
-                        ArticleState.Success(
-                            title = entry.originalWord,
-                            dslContent = annotatedStringList,
-                            dictionaryName = entry.dictionaryName,
-                            dictionaryPath = entry.dictionaryPath,
-                        )
+                        ArticleTextWarmUp.warmUp(getApplication(), article.dslContent)
                     }
+                    mutableSelectedArticle.update { article }
                 }
                 .onError { message, exception ->
                     Log.e(TAG, "loadArticle() - error: $message", exception)
@@ -324,10 +318,6 @@ class SearchViewModel(
     companion object {
         private const val TAG = "SearchViewModel"
 
-        // Parse cache: stores parsed DslBlock lists to avoid re-parsing articles
-        // Size: 50 articles - typical user navigation depth in a session
-        // Memory estimate: ~50KB per article average (text + formatting)
-        // Total: ~2.5MB worst case
         private const val PARSE_CACHE_SIZE = 50
 
         private const val KEY_SEARCH_QUERY = "search_query"

app/src/main/java/com/example/research/ui/about/AboutScreen.kt

@@ -19,7 +19,6 @@ import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.verticalScroll
 import androidx.compose.material3.AlertDialogDefaults
 import androidx.compose.material3.BasicAlertDialog
-import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Scaffold
 import androidx.compose.material3.Surface
@@ -56,7 +55,6 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.withContext
 
-@OptIn(ExperimentalMaterial3Api::class)
 @Composable
 fun AboutScreen(
     onNavigateBack: () -> Unit
@@ -71,7 +69,7 @@ fun AboutScreen(
     val uriHandler = LocalUriHandler.current
     val librariesData by produceState<AboutLibrariesData?>(initialValue = null, context) {
         value = withContext(Dispatchers.IO) {
-            AboutLibrariesParser.read(context, R.raw.aboutlibraries)
+            runCatching { AboutLibrariesParser.read(context, R.raw.aboutlibraries) }.getOrNull()
         }
     }
     var expandedLibraryId by remember { mutableStateOf<String?>(null) }
@@ -310,7 +308,6 @@ private fun AboutLibraryRow(
     }
 }
 
-@OptIn(ExperimentalMaterial3Api::class)
 @Composable
 private fun LicenseDialog(
     license: AboutLicense,

app/src/main/java/com/example/research/ui/article/ArticleScreen.kt

@@ -44,7 +44,6 @@ import androidx.compose.ui.platform.testTag
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.semantics.semantics
 import androidx.compose.ui.semantics.testTagsAsResourceId
-import androidx.compose.ui.text.AnnotatedString
 import androidx.compose.ui.text.style.LineHeightStyle
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.IntSize
@@ -55,54 +54,6 @@ import com.example.research.common.ui.theme.dictionaryTitleLarge
 import com.example.research.ui.theme.AppWindowInsets
 import com.example.research.ui.theme.Spacing
 
-private const val MERGED_BLOCK_MAX_CHARS = 1500
-private const val MERGED_BLOCK_MAX_ITEMS = 12
-
-private fun mergeDslBlocks(blocks: List<DslBlock>): List<DslBlock> {
-    if (blocks.size <= MERGED_BLOCK_MAX_ITEMS) return blocks
-    val merged = ArrayList<DslBlock>(blocks.size / 4)
-    var i = 0
-    while (i < blocks.size) {
-        val builder = AnnotatedString.Builder()
-        val refs = ArrayList<DslAnnotatedParser.LazyRef>()
-        var j = i
-        while (j < blocks.size) {
-            val block = blocks[j]
-            repeat(block.indent) { builder.append(' ') }
-            val paraStart = builder.length
-            builder.append(block.text)
-            block.lazyRefs.forEach { ref ->
-                refs.add(
-                    ref.copy(
-                        startIndex = ref.startIndex + paraStart,
-                        endIndex = ref.endIndex + paraStart
-                    )
-                )
-            }
-            val more = j + 1 < blocks.size &&
-                (j + 1 - i) < MERGED_BLOCK_MAX_ITEMS &&
-                builder.length < MERGED_BLOCK_MAX_CHARS
-            if (more) {
-                builder.append('\n')
-            }
-            j++
-            if (!more) {
-                break
-            }
-        }
-        merged.add(
-            DslBlock(
-                text = builder.toAnnotatedString(),
-                indent = 0,
-                lazyRefs = refs,
-                continuesPrevious = blocks[i].continuesPrevious
-            )
-        )
-        i = j
-    }
-    return merged
-}
-
 @Composable
 fun ArticleContent(
     articleState: ArticleState?,
@@ -183,8 +134,7 @@ fun ArticleContent(
                 }
             }
 
-            val isHeavyArticle =
-                articleState.dslContent.size > HEAVY_ARTICLE_BLOCK_COUNT
+            val isHeavyArticle = articleState.isHeavy
 
             val darkTheme = MaterialTheme.colorScheme.background.luminance() < 0.5f
             val displayBlocks = remember(
@@ -192,14 +142,12 @@ fun ArticleContent(
                 baseTextStyle,
                 darkTheme
             ) {
-                val merged =
-                    mergeDslBlocks(articleState.dslContent)
                 if (darkTheme) {
-                    merged.map {
+                    articleState.dslContent.map {
                         it.copy(text = DslAnnotatedParser.remapForDarkTheme(it.text))
                     }
                 } else {
-                    merged
+                    articleState.dslContent
                 }
             }
             val articleList: @Composable (Modifier) -> Unit = { listModifier ->

app/src/main/java/com/example/research/ui/article/ArticleState.kt

@@ -37,6 +37,7 @@ sealed class ArticleState {
         val dictionaryPath: String = "",
         val scrollIndex: Int = 0,
         val scrollOffset: Int = 0,
+        val isHeavy: Boolean = false,
     ) : ArticleState()
     @Immutable
     data class Error(

app/src/main/java/com/example/research/ui/article/ArticleTextWarmUp.kt

@@ -13,11 +13,14 @@ import kotlinx.coroutines.currentCoroutineContext
 import kotlinx.coroutines.ensureActive
 
 internal const val HEAVY_ARTICLE_BLOCK_COUNT = 100
+internal const val HEAVY_ARTICLE_TOTAL_CHARS = 1_500
 
 object ArticleTextWarmUp {
 
     suspend fun warmUp(context: Context, blocks: List<DslBlock>) {
-        if (blocks.size <= HEAVY_ARTICLE_BLOCK_COUNT) return
+        if (blocks.size <= HEAVY_ARTICLE_BLOCK_COUNT &&
+            blocks.sumOf { it.text.length } <= HEAVY_ARTICLE_TOTAL_CHARS
+        ) return
         val density = Density(context)
         val measurer = TextMeasurer(
             defaultFontFamilyResolver = createFontFamilyResolver(context),

app/src/main/java/com/example/research/ui/article/MergeDslBlocks.kt

@@ -0,0 +1,51 @@
+package com.example.research.ui.article
+
+import androidx.compose.ui.text.AnnotatedString
+
+private const val MERGED_BLOCK_MAX_CHARS = 1500
+private const val MERGED_BLOCK_MAX_ITEMS = 12
+
+internal fun mergeDslBlocks(blocks: List<DslBlock>): List<DslBlock> {
+    if (blocks.size <= MERGED_BLOCK_MAX_ITEMS) return blocks
+    val merged = ArrayList<DslBlock>(blocks.size / 4)
+    var i = 0
+    while (i < blocks.size) {
+        val builder = AnnotatedString.Builder()
+        val refs = ArrayList<DslAnnotatedParser.LazyRef>()
+        var j = i
+        while (j < blocks.size) {
+            val block = blocks[j]
+            repeat(block.indent) { builder.append(' ') }
+            val paraStart = builder.length
+            builder.append(block.text)
+            block.lazyRefs.forEach { ref ->
+                refs.add(
+                    ref.copy(
+                        startIndex = ref.startIndex + paraStart,
+                        endIndex = ref.endIndex + paraStart
+                    )
+                )
+            }
+            val more = j + 1 < blocks.size &&
+                (j + 1 - i) < MERGED_BLOCK_MAX_ITEMS &&
+                builder.length < MERGED_BLOCK_MAX_CHARS
+            if (more) {
+                builder.append('\n')
+            }
+            j++
+            if (!more) {
+                break
+            }
+        }
+        merged.add(
+            DslBlock(
+                text = builder.toAnnotatedString(),
+                indent = 0,
+                lazyRefs = refs,
+                continuesPrevious = blocks[i].continuesPrevious
+            )
+        )
+        i = j
+    }
+    return merged
+}

app/src/main/java/com/example/research/ui/main/AdaptiveMainScreen.kt

@@ -107,6 +107,7 @@ fun AdaptiveMainScreen(
                         )
                         .padding(start = Spacing.contentStart, end = listEndPadding),
                     listModifier = Modifier.windowInsetsPadding(WindowInsets.navigationBars),
+                    alignFirstResultWithTitleBar = isSearchBarAtBottom,
                 )
             },
             detailPane = {
@@ -124,7 +125,7 @@ fun AdaptiveMainScreen(
                         articleState = articleState,
                         showBackButton = isShowingDetail && articleState != null,
                         onNavigateBack = onNavigateBackFromArticle,
-                        compact = true,
+                        compact = !isSearchBarAtBottom,
                         selectionReset = titleSelectionReset.intValue,
                         modifier = Modifier.windowInsetsPadding(
                             WindowInsets.safeDrawing.only(WindowInsetsSides.Top)

app/src/main/java/com/example/research/ui/main/MainScreen.kt

@@ -64,7 +64,11 @@ fun MainRoute(
             dictionary.isActive && dictionary.articleCount > 0
         }
 
-        settingsState.downloadState is DownloadState.Idle &&
+        val downloadSettled = settingsState.downloadState.let { state ->
+            state is DownloadState.Idle || state is DownloadState.Error
+        }
+
+        downloadSettled &&
             !settingsState.indexingProgress.isIndexing &&
             settingsState.importState !is ImportState.Importing &&
             settingsState.importState !is ImportState.Extracting &&
@@ -216,6 +220,7 @@ internal fun MainScreen(
                     .fillMaxWidth()
                     .windowInsetsPadding(AppWindowInsets.horizontalSafeDrawing)
                     .padding(start = Spacing.contentStart, end = 16.dp),
+                alignFirstResultWithTitleBar = true,
             )
             searchBar()
         }

app/src/main/java/com/example/research/ui/main/SearchResultsPane.kt

@@ -16,7 +16,12 @@ import androidx.compose.runtime.setValue
 import androidx.compose.runtime.snapshotFlow
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalDensity
+import androidx.compose.ui.unit.Dp
 import androidx.compose.ui.unit.dp
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.ui.text.rememberTextMeasurer
+import com.example.research.common.ui.theme.dictionaryTitleLarge
+import com.example.research.ui.theme.Spacing
 import androidx.paging.LoadState
 import androidx.paging.compose.LazyPagingItems
 import com.example.research.core.domain.model.IndexEntry
@@ -43,6 +48,7 @@ internal fun SearchResultsPane(
     onArticleClick: (IndexEntry) -> Unit,
     modifier: Modifier = Modifier,
     listModifier: Modifier = Modifier,
+    alignFirstResultWithTitleBar: Boolean = false,
 ) {
     val listState = rememberLazyListState(
         initialFirstVisibleItemIndex = scrollPosition.first,
@@ -55,6 +61,7 @@ internal fun SearchResultsPane(
     val imeBottomPadding = with(LocalDensity.current) {
         WindowInsets.ime.getBottom(this).toDp()
     }
+    val topPadding = if (alignFirstResultWithTitleBar) titleBarAlignedTopPadding() else 0.dp
 
     LaunchedEffect(listState) {
         snapshotFlow {
@@ -139,8 +146,21 @@ internal fun SearchResultsPane(
             modifier = listModifier.weight(1f),
             listState = listState,
             showDictionaryName = showDictionaryName,
-            contentPadding = PaddingValues(bottom = imeBottomPadding),
+            contentPadding = PaddingValues(top = topPadding, bottom = imeBottomPadding),
             staleEntries = shownStale,
         )
     }
 }
+
+@Composable
+private fun titleBarAlignedTopPadding(): Dp {
+    val textMeasurer = rememberTextMeasurer(cacheSize = 0)
+    val style = MaterialTheme.typography.dictionaryTitleLarge
+    val density = LocalDensity.current
+    return remember(textMeasurer, style, density) {
+        val titleHeight = with(density) {
+            textMeasurer.measure(text = "A", style = style, maxLines = 1).size.height.toDp()
+        }
+        (Spacing.topBarCenter - Spacing.listItemVertical - titleHeight / 2).coerceAtLeast(0.dp)
+    }
+}

app/src/main/java/com/example/research/ui/main/components/MainTopBar.kt

@@ -2,6 +2,7 @@ package com.example.research.ui.main.components
 
 
 import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.WindowInsets
 import androidx.compose.foundation.layout.fillMaxWidth
@@ -28,7 +29,8 @@ import androidx.compose.material3.ModalBottomSheet
 import androidx.compose.material3.Surface
 import androidx.compose.material3.TextField
 import androidx.compose.material3.TextFieldDefaults
-import androidx.compose.material3.rememberModalBottomSheetState
+import androidx.compose.material3.SheetValue
+import androidx.compose.material3.rememberBottomSheetState
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
@@ -45,7 +47,7 @@ import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.painter.Painter
 import androidx.compose.ui.layout.boundsInWindow
 import androidx.compose.ui.layout.onGloballyPositioned
-import androidx.compose.ui.platform.LocalConfiguration
+import androidx.compose.ui.platform.LocalWindowInfo
 import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.platform.LocalFocusManager
 import androidx.compose.ui.platform.testTag
@@ -72,6 +74,7 @@ private val TopBarHeight = Spacing.topBarHeight
 private val TopBarShape = RoundedCornerShape(28.dp)
 private val HistorySheetChrome = 64.dp
 private val HistorySheetMinHeight = 300.dp
+private val HistorySheetBottomPadding = 16.dp
 
 @Composable
 fun MainTopBar(
@@ -289,12 +292,16 @@ private fun SearchHistorySheet(
     onEntryRemove: (String) -> Unit,
     onClearAll: () -> Unit
 ) {
-    val sheetState = rememberModalBottomSheetState(skipPartiallyExpanded = true)
+    val sheetState = rememberBottomSheetState(
+        initialValue = SheetValue.Hidden,
+        enabledValues = setOf(SheetValue.Hidden, SheetValue.Expanded),
+    )
     val density = LocalDensity.current
-    val screenHeight = LocalConfiguration.current.screenHeightDp.dp
+    val windowHeightPx = LocalWindowInfo.current.containerSize.height
     val navigationBarsBottom = WindowInsets.navigationBars.getBottom(density)
     val maxContentHeight = remember {
         with(density) {
+            val screenHeight = windowHeightPx.toDp()
             if (isSearchBarAtBottom) {
                 screenHeight - HistorySheetChrome - navigationBarsBottom.toDp()
             } else {
@@ -314,6 +321,7 @@ private fun SearchHistorySheet(
             onEntryClick = onEntryClick,
             onEntryRemove = onEntryRemove,
             onClearAll = onClearAll,
+            contentPadding = PaddingValues(bottom = HistorySheetBottomPadding),
             modifier = Modifier
                 .fillMaxWidth()
                 .heightIn(min = HistorySheetMinHeight, max = maxContentHeight)

app/src/main/java/com/example/research/ui/main/components/SearchResultsList.kt

@@ -6,17 +6,13 @@ import androidx.compose.foundation.lazy.*
 import androidx.compose.material3.*
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.remember
-import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.testTag
-import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.semantics.semantics
 import androidx.compose.ui.semantics.testTagsAsResourceId
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
-import androidx.paging.LoadState
 import androidx.paging.compose.*
-import com.example.research.R
 import com.example.research.common.ui.theme.dictionaryTitleLarge
 import com.example.research.core.domain.model.IndexEntry
 import com.example.research.core.util.removeDictionarySuffixes
@@ -53,7 +49,7 @@ fun SearchResultsList(
             contentType = { "search_result" }
         ) { index ->
             val entry = if (showStale) staleEntries.getOrNull(index)
-            else if (index in 0 until results.itemCount) results.peek(index) else null
+            else if (index in 0 until results.itemCount) results[index] else null
             if (entry != null) {
                 SearchResultItem(
                     entry = entry,
@@ -63,26 +59,6 @@ fun SearchResultsList(
                 )
             }
         }
-
-        when (results.loadState.append) {
-            is LoadState.Error -> {
-                item {
-                    Box(
-                        modifier = Modifier
-                            .fillMaxWidth()
-                            .padding(16.dp),
-                        contentAlignment = Alignment.Center
-                    ) {
-                        Text(
-                            text = stringResource(R.string.error_loading_more),
-                            style = MaterialTheme.typography.bodyMedium,
-                            color = MaterialTheme.colorScheme.error
-                        )
-                    }
-                }
-            }
-            else -> {}
-        }
     }
 }
 

app/src/main/java/com/example/research/ui/settings/SettingsScreen.kt

@@ -19,7 +19,6 @@ import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.lazy.LazyColumn
-import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Scaffold
@@ -104,7 +103,6 @@ fun SettingsRoute(
     )
 }
 
-@OptIn(ExperimentalMaterial3Api::class)
 @Composable
 fun SettingsScreen(
     uiState: SettingsUiState,

app/src/main/java/com/example/research/ui/settings/SettingsViewModel.kt

@@ -37,6 +37,16 @@ import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import java.util.concurrent.ConcurrentHashMap
 
+private const val STATUS_UP_TO_DATE = "UpToDate"
+private const val STATUS_NEEDS_UPDATE = "NeedsUpdate"
+private const val STATUS_EMPTY = "Empty"
+
+private data class PersistedDictionaryStatus(
+    val name: String,
+    val date: String,
+    val sourceIds: Set<String>,
+)
+
 private data class DictionaryStateInputs(
     val theme: AppTheme,
     val dictionarySources: List<DictionarySource>,
@@ -115,14 +125,18 @@ class SettingsViewModel(
     private fun persistDictionaryStatus() {
         viewModelScope.launch {
             dictionaryStatus.collect { status ->
-                val persistedName = when (status) {
-                    DictionaryStatus.UpToDate -> "UpToDate"
-                    DictionaryStatus.NeedsUpdate -> "NeedsUpdate"
-                    DictionaryStatus.Empty -> "Empty"
+                val persisted = when (status) {
+                    DictionaryStatus.UpToDate ->
+                        "$STATUS_UP_TO_DATE|${DateUtils.getCurrentDateString()}"
+                    is DictionaryStatus.NeedsUpdate ->
+                        "$STATUS_NEEDS_UPDATE|${DateUtils.getCurrentDateString()}|" +
+                            status.sourceIds.joinToString(",")
+                    DictionaryStatus.Empty ->
+                        "$STATUS_EMPTY|${DateUtils.getCurrentDateString()}"
                     else -> null
                 }
-                if (persistedName != null) {
-                    preferencesManager.saveDictionaryStatus("$persistedName|${DateUtils.getCurrentDateString()}")
+                if (persisted != null) {
+                    preferencesManager.saveDictionaryStatus(persisted)
                 }
             }
         }
@@ -202,14 +216,21 @@ class SettingsViewModel(
                         }
                     }
                     is DownloadState.Error -> {
+                        val startedHere = statusBeforeDownload != DictionaryStatus.Unknown ||
+                            isDownloadInProgress
                         isDownloadInProgress = false
                         if (!errorStateHandled) {
                             errorStateHandled = true
-                            dictionaryStatus.value = if (dictionaryState.dictionaries.isEmpty()) {
-                                DictionaryStatus.Empty
-                            } else when (statusBeforeDownload) {
-                                DictionaryStatus.Unknown, DictionaryStatus.Checking -> DictionaryStatus.UpToDate
-                                else -> statusBeforeDownload
+                            if (dictionaryState.dictionaries.isEmpty()) {
+                                dictionaryStatus.value = DictionaryStatus.Empty
+                            } else if (startedHere) {
+                                when (statusBeforeDownload) {
+                                    DictionaryStatus.Unknown, DictionaryStatus.Checking ->
+                                        viewModelScope.launch {
+                                            restoreOrEvaluateDictionaryStatus()
+                                        }
+                                    else -> dictionaryStatus.value = statusBeforeDownload
+                                }
                             }
                             if (pendingSourceUrls.isNotEmpty()) {
                                 pendingSourceUrls.forEach { urlTemplate ->
@@ -283,7 +304,7 @@ class SettingsViewModel(
                 scanCompleted = if (localDictionaryRepository.dictionaries.value.isEmpty()) {
                     scanDirectoryInternal(preferencesManager.dictionaryPath) is OperationResult.Success
                 } else {
-                    dictionaryStatus.value = DictionaryStatus.UpToDate
+                    restoreOrEvaluateDictionaryStatus()
                     false
                 }
             } catch (e: Exception) {
@@ -365,8 +386,8 @@ class SettingsViewModel(
                 return DictionaryStatus.UpToDate
             }
 
-            val upToDate = dictionaryRepository.areDictionariesUpToDate(enabledSources)
-            return if (upToDate) DictionaryStatus.UpToDate else DictionaryStatus.NeedsUpdate
+            val updatable = dictionaryRepository.sourcesWithUpdates(enabledSources)
+            return if (updatable.isEmpty()) DictionaryStatus.UpToDate else DictionaryStatus.NeedsUpdate(updatable)
         } catch (e: Exception) {
             android.util.Log.e("SettingsViewModel", "evaluateDictionaryStatus: Error", e)
             if (localDictionaryRepository.dictionaries.value.isNotEmpty()) {
@@ -551,6 +572,71 @@ class SettingsViewModel(
     ): List<DictionarySource> =
         DictionarySourceFileMatcher.installedSources(sources, dictionaries)
 
+    private suspend fun restoreOrEvaluateDictionaryStatus() {
+        val restored = restorePersistedDictionaryStatus()
+        if (restored != null) {
+            dictionaryStatus.value = restored
+            return
+        }
+        dictionaryStatus.value = DictionaryStatus.Checking
+        dictionaryStatus.value = withContext(Dispatchers.IO) { evaluateDictionaryStatus() }
+    }
+
+    private suspend fun restorePersistedDictionaryStatus(): DictionaryStatus? {
+        val persisted = readPersistedDictionaryStatus() ?: return null
+        if (persisted.date != DateUtils.getCurrentDateString()) return null
+        return when (persisted.name) {
+            STATUS_UP_TO_DATE ->
+                if (withContext(Dispatchers.IO) { installedDictionariesAreCurrent() }) {
+                    DictionaryStatus.UpToDate
+                } else {
+                    null
+                }
+            STATUS_NEEDS_UPDATE -> {
+                val updatableIds = withContext(Dispatchers.IO) { sourcesMissingTodaysFile() }
+                val restorableIds = persisted.sourceIds intersect updatableIds
+                if (restorableIds.isNotEmpty()) DictionaryStatus.NeedsUpdate(restorableIds) else null
+            }
+            else -> null
+        }
+    }
+
+    private suspend fun readPersistedDictionaryStatus(): PersistedDictionaryStatus? {
+        val raw = preferencesManager.dictionaryStatus() ?: return null
+        val parts = raw.split('|')
+        if (parts.isEmpty() || parts.first().isEmpty()) return null
+        return PersistedDictionaryStatus(
+            name = parts.first(),
+            date = parts.getOrElse(1) { "" },
+            sourceIds = parts.getOrElse(2) { "" }
+                .split(',')
+                .map(String::trim)
+                .filter(String::isNotEmpty)
+                .toSet(),
+        )
+    }
+
+    private suspend fun sourcesMissingTodaysFile(): Set<String> {
+        val sources = preferencesManager.dictionarySources.first()
+        val dictionaries = localDictionaryRepository.dictionaries.first()
+        val datedEnabledSources = installedEnabledSources(sources, dictionaries)
+            .filter { DictionarySource.hasDatePlaceholder(it.urlTemplate) }
+        if (datedEnabledSources.isEmpty()) return emptySet()
+        val fileNames = localDictionaryRepository.listDictionaryPayloadFileNames(
+            preferencesManager.dictionaryPath
+        ) ?: return emptySet()
+        val today = DateUtils.getCurrentDateString()
+        return datedEnabledSources
+            .filterNot { source -> fileNames.any { it.startsWith(fileBaseNameFor(source, today)) } }
+            .mapTo(mutableSetOf(), DictionarySource::id)
+    }
+
+    private fun fileBaseNameFor(source: DictionarySource, date: String): String =
+        DictionarySource.extractFileName(source.urlTemplate, date)
+            .removeSuffix(".gz")
+            .removeSuffix(".dsl")
+            .removeSuffix(".dz")
+
     private suspend fun installedDictionariesAreCurrent(): Boolean {
         val sources = preferencesManager.dictionarySources.first()
         val dictionaries = localDictionaryRepository.dictionaries.first()
@@ -562,11 +648,7 @@ class SettingsViewModel(
         ) ?: return true
         val today = DateUtils.getCurrentDateString()
         return datedEnabledSources.all { source ->
-            val baseName = DictionarySource.extractFileName(source.urlTemplate, today)
-                .removeSuffix(".gz")
-                .removeSuffix(".dsl")
-                .removeSuffix(".dz")
-            fileNames.any { it.startsWith(baseName) }
+            fileNames.any { it.startsWith(fileBaseNameFor(source, today)) }
         }
     }
 
@@ -622,24 +704,7 @@ class SettingsViewModel(
                     dictionaryStatus.value = DictionaryStatus.UpToDate
                     isDownloadInProgress = false
                 } else {
-                    val savedStatus = preferencesManager.dictionaryStatus()
-                    val savedStatusName = savedStatus?.substringBefore('|')
-                    val savedStatusDate = savedStatus?.substringAfter('|', "")
-                    val restoredStatus = when (savedStatusName) {
-                        "UpToDate" -> DictionaryStatus.UpToDate
-                        "NeedsUpdate" -> DictionaryStatus.NeedsUpdate
-                        else -> null
-                    }
-                    if (restoredStatus != null &&
-                        savedStatusDate == DateUtils.getCurrentDateString() &&
-                        withContext(Dispatchers.IO) { installedDictionariesAreCurrent() }
-                    ) {
-                        dictionaryStatus.value = restoredStatus
-                    } else {
-                        dictionaryStatus.value = DictionaryStatus.Checking
-                        val status = withContext(Dispatchers.IO) { evaluateDictionaryStatus() }
-                        dictionaryStatus.value = status
-                    }
+                    restoreOrEvaluateDictionaryStatus()
                 }
 
                 if (result.data > 0) {

app/src/main/java/com/example/research/ui/settings/components/DictionaryListItem.kt

@@ -50,6 +50,7 @@ import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.Dp
 import androidx.compose.ui.unit.dp
 import com.example.research.R
+import com.example.research.common.ui.components.BadgedIcon
 import com.example.research.core.domain.model.Dictionary
 import kotlinx.coroutines.launch
 
@@ -84,7 +85,8 @@ fun DictionaryListItem(
     onToggle: () -> Unit,
     onDelete: () -> Unit,
     modifier: Modifier = Modifier,
-    isDeleteBlocked: () -> Boolean = { false }
+    isDeleteBlocked: () -> Boolean = { false },
+    hasUpdate: Boolean = false,
 ) {
     val haptic = LocalHapticFeedback.current
     val density = LocalDensity.current
@@ -195,11 +197,15 @@ fun DictionaryListItem(
                 modifier = Modifier.size(IconButtonSize),
                 contentAlignment = Alignment.Center
             ) {
-                Icon(
+                BadgedIcon(
                     painter = painterResource(R.drawable.ic_book),
-                    contentDescription = null,
                     tint = MaterialTheme.colorScheme.primary,
-                    modifier = Modifier.size(IconSize)
+                    size = IconSize,
+                    badgeDescription = if (hasUpdate) {
+                        stringResource(R.string.dictionary_update_available)
+                    } else {
+                        null
+                    },
                 )
             }
 

app/src/main/java/com/example/research/ui/settings/components/DictionaryManagement.kt

@@ -16,7 +16,8 @@ import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.ModalBottomSheet
-import androidx.compose.material3.rememberModalBottomSheetState
+import androidx.compose.material3.SheetValue
+import androidx.compose.material3.rememberBottomSheetState
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.derivedStateOf
@@ -47,6 +48,7 @@ import com.example.research.common.ui.components.CollapsibleHeader
 import com.example.research.common.ui.components.EmptyState
 import com.example.research.common.ui.components.SectionCard
 import com.example.research.core.domain.model.Dictionary
+import com.example.research.core.domain.usecase.DictionarySourceFileMatcher
 import com.example.research.core.domain.model.DictionarySource
 import com.example.research.feature.download.model.DownloadState
 import com.example.research.ui.settings.ImportState
@@ -75,7 +77,10 @@ fun DictionaryManagement(
 ) {
     val (showUrlBottomSheet, setShowUrlBottomSheet) = remember { mutableStateOf(false) }
 
-    val sheetState = rememberModalBottomSheetState(skipPartiallyExpanded = true)
+    val sheetState = rememberBottomSheetState(
+        initialValue = SheetValue.Hidden,
+        enabledValues = setOf(SheetValue.Hidden, SheetValue.Expanded),
+    )
     val haptic = LocalHapticFeedback.current
     val focusManager = LocalFocusManager.current
 
@@ -90,6 +95,21 @@ fun DictionaryManagement(
         derivedStateOf { importState is ImportState.Importing || importState is ImportState.Extracting }
     }
     val hasEnabledSources by remember(sources) { derivedStateOf { sources.any { it.isEnabled } } }
+    val isUpdateAvailable = dictionaryStatus is DictionaryStatus.NeedsUpdate &&
+        !isInProgress && hasEnabledSources && dictionaries.isNotEmpty()
+    val updatablePaths = remember(dictionaryStatus, sources, dictionaries, isUpdateAvailable) {
+        val ids = (dictionaryStatus as? DictionaryStatus.NeedsUpdate)?.sourceIds
+        if (!isUpdateAvailable || ids.isNullOrEmpty()) {
+            emptySet()
+        } else {
+            val updatableSources = sources.filter { it.id in ids }
+            dictionaries
+                .filter { dictionary ->
+                    updatableSources.any { DictionarySourceFileMatcher.matches(it, dictionary) }
+                }
+                .mapTo(mutableSetOf(), Dictionary::path)
+        }
+    }
 
     // Invariant: the mutation-block flag is read only at state-read/gesture time (derivedStateOf,
     // snapshotFlow, pointerInput callbacks), never at row composition time. A composition-time read
@@ -118,7 +138,12 @@ fun DictionaryManagement(
                 isExpanded = isExpanded,
                 onToggle = onToggleExpanded,
                 subtitle = headerSubtitle,
-                testTag = "dictionary_header"
+                testTag = "dictionary_header",
+                badgeDescription = if (isUpdateAvailable && !isExpanded) {
+                    stringResource(R.string.dictionaries_update_available)
+                } else {
+                    null
+                },
             )
 
             AnimatedVisibility(
@@ -178,7 +203,7 @@ fun DictionaryManagement(
                             )
                         }
                     } else {
-                        if (dictionaryStatus is DictionaryStatus.NeedsUpdate && !isInProgress && hasEnabledSources) {
+                        if (isUpdateAvailable) {
                             DictionaryUpdateCard(
                                 onStartDownload = onStartDownload,
                                 modifier = backgroundModifier
@@ -192,7 +217,8 @@ fun DictionaryManagement(
                             modifier = Modifier
                                 .fillMaxWidth()
                                 .then(backgroundModifier),
-                            isDeleteBlocked = isDeleteBlocked
+                            isDeleteBlocked = isDeleteBlocked,
+                            updatablePaths = updatablePaths,
                         )
 
                         if (!isInProgress) {
@@ -264,6 +290,7 @@ private fun DictionaryProgressSectionHost(
         label = label,
         onCancel = onCancel,
         percent = progressSnapshot?.percent ?: 0,
+        indeterminate = progressSnapshot?.indeterminate ?: false,
         testTag = progressTestTag,
     )
 }
@@ -274,7 +301,8 @@ private fun DictionaryListSection(
     onToggleDictionary: (String) -> Unit,
     onDeleteDictionary: (Dictionary) -> Unit,
     modifier: Modifier = Modifier,
-    isDeleteBlocked: () -> Boolean = { false }
+    isDeleteBlocked: () -> Boolean = { false },
+    updatablePaths: Set<String> = emptySet(),
 ) {
     var appearedPaths by remember { mutableStateOf(emptySet<String>()) }
     LaunchedEffect(dictionaries) {
@@ -301,7 +329,8 @@ private fun DictionaryListSection(
                         dictionary = dictionary,
                         onToggle = { onToggleDictionary(dictionary.path) },
                         onDelete = { onDeleteDictionary(dictionary) },
-                        isDeleteBlocked = isDeleteBlocked
+                        isDeleteBlocked = isDeleteBlocked,
+                        hasUpdate = dictionary.path in updatablePaths,
                     )
                 }
             }

app/src/main/java/com/example/research/ui/settings/components/DictionaryProgressSection.kt

@@ -12,6 +12,7 @@ import androidx.compose.foundation.layout.*
 import androidx.compose.ui.res.painterResource
 import androidx.compose.material3.*
 import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.platform.testTag
@@ -31,6 +32,7 @@ fun DictionaryProgressSection(
     onCancel: () -> Unit,
     modifier: Modifier = Modifier,
     percent: Int,
+    indeterminate: Boolean,
     testTag: String,
 ) {
     AnimatedVisibility(
@@ -44,6 +46,7 @@ fun DictionaryProgressSection(
         var displayedLabel by remember { mutableStateOf(label) }
         var displayedPercent by remember { mutableIntStateOf(percent) }
         var displayedTestTag by remember { mutableStateOf(testTag) }
+        var displayedIndeterminate by remember { mutableStateOf(indeterminate) }
 
         LaunchedEffect(visible) {
             if (visible) {
@@ -60,6 +63,7 @@ fun DictionaryProgressSection(
                 displayedLabel = label
                 displayedPercent = percent
                 displayedTestTag = testTag
+                displayedIndeterminate = indeterminate
             }
         }
         val animatedState = remember { Animatable(0f) }
@@ -88,13 +92,23 @@ fun DictionaryProgressSection(
                     style = MaterialTheme.typography.bodySmall,
                     color = MaterialTheme.colorScheme.primary
                 )
+                if (!displayedIndeterminate) {
                     Text(
                         text = "$displayedPercent%",
                         style = MaterialTheme.typography.bodySmall,
                         color = MaterialTheme.colorScheme.primary
                     )
                 }
-            Spacer(Modifier.height(8.dp))
+            }
+            Box(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .height(WavyProgressIndicatorDefaults.LinearContainerHeight),
+                contentAlignment = Alignment.Center,
+            ) {
+                if (displayedIndeterminate) {
+                    LinearWavyProgressIndicator(modifier = Modifier.fillMaxWidth())
+                } else {
                     LinearProgressIndicator(
                         progress = { animatedProgress },
                         modifier = Modifier
@@ -102,7 +116,9 @@ fun DictionaryProgressSection(
                             .height(4.dp)
                             .clip(MaterialTheme.shapes.small),
                     )
-            Spacer(Modifier.height(8.dp))
+                }
+            }
+            Spacer(Modifier.height(4.dp))
             OutlinedButton(
                 onClick = onCancel,
                 modifier = Modifier.fillMaxWidth(),

app/src/main/java/com/example/research/ui/theme/Spacing.kt

@@ -6,6 +6,7 @@ object Spacing {
     // Semantic spacing constants for specific UI elements
     val topBarPadding = 8.dp
     val topBarHeight = 56.dp
+    val topBarCenter = topBarPadding + topBarHeight / 2
     val listItemVertical = 8.dp
 
     val contentStart = 32.dp

app/src/main/res/values-ru/strings.xml

@@ -62,7 +62,6 @@
     <string name="error_scan_directory_failed">Не удалось просканировать папку со словарями</string>
     <string name="error_search_failed">Ошибка поиска запроса \'%1$s\' в %2$s</string>
     <string name="error_failed_load_index_metadata">Не удалось загрузить метаданные индекса: %1$s</string>
-    <string name="error_loading_more">Ошибка загрузки</string>
     <plurals name="active_dictionaries_count">
         <item quantity="one">%1$d активный словарь</item>
         <item quantity="few">%1$d активных словаря</item>
@@ -88,6 +87,7 @@
     <string name="dictionary_source_suspicious_characters">URL содержит недопустимые символы</string>
     <string name="dictionaries_not_downloaded">Словари еще не загружены</string>
     <string name="dictionaries_update_available">Доступны обновления словарей</string>
+    <string name="dictionary_update_available">Доступно обновление</string>
     <string name="action_cancel">Отмена</string>
     <string name="action_add">Добавить</string>
     <string name="action_add_another_url">Добавить ещё URL</string>

app/src/main/res/values/strings.xml

@@ -62,7 +62,6 @@
     <string name="error_scan_directory_failed">Failed to scan dictionary folder</string>
     <string name="error_search_failed">Search failed for query \'%1$s\' in %2$s</string>
     <string name="error_failed_load_index_metadata">Failed to load index metadata: %1$s</string>
-    <string name="error_loading_more">Loading error</string>
     <plurals name="active_dictionaries_count">
         <item quantity="one">%1$d active dictionary</item>
         <item quantity="other">%1$d active dictionaries</item>
@@ -86,6 +85,7 @@
     <string name="dictionary_source_suspicious_characters">URL contains invalid characters</string>
     <string name="dictionaries_not_downloaded">No dictionaries downloaded yet</string>
     <string name="dictionaries_update_available">Dictionary updates available</string>
+    <string name="dictionary_update_available">Update available</string>
     <string name="action_cancel">Cancel</string>
     <string name="action_add">Add</string>
     <string name="action_add_another_url">Add another URL</string>

build.gradle.kts

@@ -2,7 +2,7 @@ plugins {
     alias(libs.plugins.aboutlibraries) apply false
     alias(libs.plugins.android.application) apply false
     alias(libs.plugins.kotlin.compose) apply false
-    id("com.github.ben-manes.versions") version "0.54.0"
+    id("com.github.ben-manes.versions") version "0.65.0"
 }
 tasks.register("assembleDebug") {
     dependsOn(":app:assembleDebug")

fastlane/metadata/android/en-US/changelogs/12.txt

@@ -0,0 +1,6 @@
+- Search loads all prefix matches; broad prefix searches are much faster
+- Fixed indexing progress freezing on large dictionaries
+- Large articles open faster
+- Numbered results sort in numeric order
+- UI improvements
+- Updated libraries and build tooling

fastlane/metadata/android/ru-RU/changelogs/12.txt

@@ -0,0 +1,6 @@
+- Поиск загружает все совпадения по префиксу и стал значительно быстрее
+- Исправлено зависание прогресса индексации больших словарей
+- Большие статьи открываются быстрее
+- Нумерованные результаты идут по порядку номеров
+- Улучшения интерфейса
+- Обновлены библиотеки и инструментарий сборки

gradle/libs.versions.toml

@@ -1,23 +1,24 @@
 [versions]
-aboutlibraries = "15.2.0"
+aboutlibraries = "15.3.0"
 activity_compose = "1.13.0"
 agp = "9.4.1"
 compose_bom = "2026.09.00"
 core = "1.19.1"
-datastore_preferences = "1.2.1"
+datastore_preferences = "1.3.0"
 documentfile = "1.1.0"
-kotlin = "2.4.20"
+kotlin = "2.4.21"
 lifecycle_runtime_ktx = "2.11.0"
+material3 = "1.5.0-beta01"
 okhttp = "5.5.0"
-paging = "3.5.1"
+paging = "3.5.3"
 profileinstaller = "1.4.1"
 kotlinx_coroutines = "1.11.0"
-kotlinx_serialization = "1.11.0"
+kotlinx_serialization = "1.12.0"
 
 [libraries]
 androidx-activity-compose = { module = "androidx.activity:activity-compose", version.ref = "activity_compose" }
 androidx-compose-bom = { group = "androidx.compose", name = "compose-bom", version.ref = "compose_bom" }
-androidx-compose-material3 = { group = "androidx.compose.material3", name = "material3" }
+androidx-compose-material3 = { group = "androidx.compose.material3", name = "material3", version.ref = "material3" }
 androidx-compose-material3-adaptive-layout = { group = "androidx.compose.material3.adaptive", name = "adaptive-layout" }
 androidx-compose-runtime-tracing = { module = "androidx.compose.runtime:runtime-tracing" }
 androidx-compose-ui = { group = "androidx.compose.ui", name = "ui" }

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-9.8.0-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.8.2-bin.zip
 networkTimeout=10000
 retries=0
 retryBackOffMs=500

gradlew.bat

@@ -26,6 +26,33 @@
 @rem Set local scope for the variables, and ensure extensions are enabled
 setlocal EnableExtensions
 
+@rem Catch executions from older scripts and ensure they exit cleanly.
+@rem This can be removed once we can be reasonably confident that few people
+@rem will be migrating directly to this new wrapper.
+goto afterSafetyNet
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+goto exitWithErrorLevel
+:afterSafetyNet
+
 set DIRNAME=%~dp0
 if "%DIRNAME%"=="" set DIRNAME=.
 @rem This is normally unused
@@ -45,13 +72,14 @@ set JAVA_EXE=java.exe
 %JAVA_EXE% -version >NUL 2>&1
 if %ERRORLEVEL% equ 0 goto execute
 
-echo. 1>&2
-echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
-echo. 1>&2
-echo Please set the JAVA_HOME variable in your environment to match the 1>&2
-echo location of your Java installation. 1>&2
+1>&2 echo.
+1>&2 echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+1>&2 echo.
+1>&2 echo Please set the JAVA_HOME variable in your environment to match the
+1>&2 echo location of your Java installation.
 
 "%COMSPEC%" /c exit 1
+goto exitWithErrorLevel
 
 :findJavaFromJavaHome
 set JAVA_HOME=%JAVA_HOME:"=%
@@ -59,13 +87,14 @@ set JAVA_EXE=%JAVA_HOME%/bin/java.exe
 
 if exist "%JAVA_EXE%" goto execute
 
-echo. 1>&2
-echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
-echo. 1>&2
-echo Please set the JAVA_HOME variable in your environment to match the 1>&2
-echo location of your Java installation. 1>&2
+1>&2 echo.
+1>&2 echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+1>&2 echo.
+1>&2 echo Please set the JAVA_HOME variable in your environment to match the
+1>&2 echo location of your Java installation.
 
 "%COMSPEC%" /c exit 1
+goto exitWithErrorLevel
 
 :execute
 @rem Setup the command line
@@ -75,8 +104,9 @@ echo location of your Java installation. 1>&2
 @rem Execute gradlew
 @rem endlocal doesn't take effect until after the line is parsed and variables are expanded
 @rem which allows us to clear the local environment before executing the java command
-endlocal & "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %* & call :exitWithErrorLevel
+endlocal & "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %* & call :exitWithErrorLevel & goto exitWithErrorLevel
 
+@rem This label must not be changed. We rely on old scripts being able to jump to this point.
 :exitWithErrorLevel
 @rem Use "%COMSPEC%" /c exit to allow operators to work properly in scripts
 "%COMSPEC%" /c exit %ERRORLEVEL%