fix: latch terminal notification state and post pipeline progress on one thread

A late ImportState Success snapshot collected after the success
notification overwrote it with an ongoing progress record. Post
progress on Main behind a volatile terminal latch; notifications go
through NotificationPort, the pipeline lives in the coordinator, and
the service finish is injected.

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

@@ -1,5 +1,8 @@
 package com.example.research
 
+import androidx.compose.runtime.Immutable
+
+@Immutable
 sealed interface DictionaryStatus {
     data object Unknown : DictionaryStatus
     data object Checking : DictionaryStatus

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

@@ -83,6 +83,7 @@ class MainActivity : ComponentActivity() {
         val app = application as ReSearchApplication
         val initialTheme = loadInitialTheme(app)
         val initialLanguage = loadInitialLanguage(app)
+        val initialHadNoDictionaries = loadInitialHadNoDictionaries(app)
 
         handleIntent(intent)
         setContent {
@@ -104,7 +105,8 @@ class MainActivity : ComponentActivity() {
                         ) {
                             AppNavigation(
                                 searchViewModel = searchViewModel,
-                                settingsViewModel = settingsViewModel
+                                settingsViewModel = settingsViewModel,
+                                seedNoDictionaries = initialHadNoDictionaries
                             )
                         }
                     }
@@ -165,6 +167,16 @@ class MainActivity : ComponentActivity() {
         }
     }
 
+    private fun loadInitialHadNoDictionaries(app: ReSearchApplication): Boolean {
+        return try {
+            runBlocking {
+                app.preferencesManager.hadNoDictionaries.first()
+            }
+        } catch (e: Exception) {
+            true
+        }
+    }
+
     override fun onNewIntent(intent: Intent) {
         super.onNewIntent(intent)
         handleIntent(intent)

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

@@ -2,6 +2,7 @@ package com.example.research
 
 import android.app.Application
 import com.example.research.common.progress.DictionaryProgressStateHolder
+import com.example.research.common.util.NotificationHelper
 import com.example.research.data.local.preferences.PreferencesManager
 import com.example.research.data.repository.LocalDictionaryRepository
 import com.example.research.feature.download.DownloadManager
@@ -36,11 +37,18 @@ class ReSearchApplication : Application() {
         private set
     lateinit var dictionaryProgressStateHolder: DictionaryProgressStateHolder
         private set
+    lateinit var dictionaryProgressPresenter: com.example.research.common.progress.DictionaryProgressPresenter
+        private set
+    lateinit var dictionaryPipelineCoordinator: com.example.research.common.progress.DictionaryPipelineCoordinator
+        private set
     private val applicationScope = CoroutineScope(SupervisorJob() + Dispatchers.Default)
 
     override fun onCreate() {
         super.onCreate()
 
+        val notificationHelper = NotificationHelper(this)
+        notificationHelper.cancelProgressNotification()
+
         preferencesManager = PreferencesManager(this)
         applicationScope.launch(Dispatchers.IO) {
             preferencesManager.sanitizeDictionarySources()
@@ -77,6 +85,40 @@ class ReSearchApplication : Application() {
             localDictionaryRepository = localDictionaryRepository,
         )
 
+        dictionaryProgressPresenter = com.example.research.common.progress.DictionaryProgressPresenter(
+            scope = applicationScope,
+            progressSnapshot = dictionaryProgressStateHolder.progressSnapshot,
+            notifications = notificationHelper,
+        )
+
+        dictionaryPipelineCoordinator = com.example.research.common.progress.DictionaryPipelineCoordinator(
+            scope = applicationScope,
+            steps = com.example.research.common.progress.DefaultReindexingSteps(
+                localDictionaryRepository = localDictionaryRepository,
+                downloadDictionaryRepository = downloadDictionaryRepository,
+            ),
+            importOperations = dictionaryImportManager,
+            ui = dictionaryProgressPresenter,
+            dictionaryPath = { preferencesManager.dictionaryPath },
+            finishService = {
+                val intent = android.content.Intent(
+                    this,
+                    com.example.research.feature.download.service.DictionaryForegroundService::class.java
+                ).apply {
+                    action = com.example.research.feature.download.service.DictionaryForegroundService.ACTION_FINISH
+                }
+                try {
+                    startService(intent)
+                } catch (_: Exception) {
+                }
+            },
+        )
+
+        dictionaryImportManager.onFlowStarted = { dictionaryProgressPresenter.beginFlow() }
+        dictionaryImportManager.onTerminal = dictionaryPipelineCoordinator::onImportTerminal
+        downloadManager.onFlowStarted = { dictionaryProgressPresenter.beginFlow() }
+        downloadManager.onDownloadSuccess = dictionaryPipelineCoordinator::onDownloadSuccess
+        downloadManager.onTerminal = dictionaryPipelineCoordinator::onDownloadTerminal
     }
 
     override fun onTrimMemory(level: Int) {

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

@@ -0,0 +1,131 @@
+package com.example.research.common.progress
+
+import com.example.research.core.util.OperationResult
+import com.example.research.feature.download.model.DownloadState
+import com.example.research.ui.settings.ImportState
+import kotlinx.coroutines.CancellationException
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+import java.io.File
+import kotlin.time.Duration.Companion.seconds
+
+class DictionaryPipelineCoordinator(
+    private val scope: CoroutineScope,
+    private val steps: ReindexingSteps,
+    private val importOperations: ImportFlowOperations,
+    private val ui: PipelineTerminalUi,
+    private val dictionaryPath: () -> String,
+    private val finishService: () -> Unit,
+    private val launchDispatcher: CoroutineDispatcher = Dispatchers.Main,
+    private val ioDispatcher: CoroutineDispatcher = Dispatchers.IO,
+) {
+    private var pipelineJob: Job? = null
+
+    fun onImportTerminal(state: ImportState) {
+        when (state) {
+            is ImportState.Success -> runPipeline(isImport = true)
+            is ImportState.Error -> {
+                ui.showError()
+                finishService()
+            }
+            else -> {}
+        }
+    }
+
+    fun onDownloadSuccess() = runPipeline(isImport = false)
+
+    fun onDownloadTerminal(state: DownloadState) {
+        when (state) {
+            is DownloadState.Error -> {
+                ui.showError()
+                finishService()
+            }
+            is DownloadState.Cancelled -> {
+                ui.cancelProgress()
+                finishService()
+            }
+            else -> {}
+        }
+    }
+
+    fun cancelPipeline() {
+        pipelineJob?.cancel()
+        pipelineJob = null
+    }
+
+    private fun runPipeline(isImport: Boolean) {
+        pipelineJob?.cancel()
+        pipelineJob = scope.launch(launchDispatcher) {
+            val dir = if (isImport) File(dictionaryPath()) else null
+            val filesBeforeReindex = dir?.listFiles()?.map { it.name }?.toSet() ?: emptySet()
+            try {
+                triggerReindexing(isImport)
+                if (isImport) {
+                    importOperations.getAndClearImportedFiles()
+                    importOperations.clearImportState()
+                    ui.showImportSuccess()
+                } else {
+                    ui.showDownloadSuccess()
+                }
+            } catch (e: CancellationException) {
+                if (isImport) {
+                    val filesToCleanup = importOperations.getAndClearImportedFiles()
+                    filesToCleanup.forEach { file ->
+                        try {
+                            if (file.exists()) file.delete()
+                        } catch (_: Exception) {
+                        }
+                    }
+                    cleanupNewFiles(dir, filesBeforeReindex)
+                }
+                throw e
+            } catch (e: Exception) {
+                ui.showError()
+            } finally {
+                finishService()
+            }
+        }
+    }
+
+    private suspend fun triggerReindexing(isImport: Boolean) = withContext(ioDispatcher) {
+        steps.waitForIndexingCompletion()
+        delay(1.seconds)
+
+        val path = dictionaryPath()
+        if (isImport) {
+            importOperations.updateExtractionProgress(0f)
+        }
+        steps.extractArchives(onProgress = { progress ->
+            if (isImport) {
+                importOperations.updateExtractionProgress(progress)
+            }
+        })
+        val result = steps.scanDirectory(path)
+        if (result is OperationResult.Success && result.data > 0) {
+            steps.warmupIndexes()
+            steps.performAllCleanup()
+        }
+        if (isImport) {
+            importOperations.markImportPipelineSuccess()
+        }
+    }
+
+    private fun cleanupNewFiles(dir: File?, filesBeforeSnapshot: Set<String>) {
+        try {
+            dir?.listFiles()?.forEach { file ->
+                if (file.name !in filesBeforeSnapshot) {
+                    try {
+                        file.delete()
+                    } catch (_: Exception) {
+                    }
+                }
+            }
+        } catch (_: Exception) {
+        }
+    }
+}

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

@@ -0,0 +1,56 @@
+package com.example.research.common.progress
+
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.launch
+
+class DictionaryProgressPresenter(
+    private val scope: CoroutineScope,
+    private val progressSnapshot: StateFlow<DictionaryProgressModel.Snapshot?>,
+    private val notifications: NotificationPort,
+    mainDispatcher: CoroutineDispatcher = Dispatchers.Main,
+) : PipelineTerminalUi {
+    @Volatile
+    private var terminalActive = false
+
+    init {
+        scope.launch(mainDispatcher) {
+            progressSnapshot.collect { snapshot ->
+                when {
+                    snapshot == null -> {
+                        if (!terminalActive && notifications.hasActiveProgressNotification()) {
+                            notifications.cancelProgressNotification()
+                        }
+                    }
+                    !terminalActive -> notifications.showProgress(snapshot.percent, snapshot.titleRes)
+                }
+            }
+        }
+    }
+
+    fun beginFlow() {
+        terminalActive = false
+    }
+
+    override fun showImportSuccess() {
+        notifications.showImportSuccess()
+        terminalActive = true
+    }
+
+    override fun showDownloadSuccess() {
+        notifications.showDownloadSuccess()
+        terminalActive = true
+    }
+
+    override fun showError() {
+        notifications.showError()
+        terminalActive = true
+    }
+
+    override fun cancelProgress() {
+        terminalActive = false
+        notifications.cancelProgressNotification()
+    }
+}

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

@@ -0,0 +1,10 @@
+package com.example.research.common.progress
+
+interface NotificationPort {
+    fun showProgress(percent: Int, titleRes: Int)
+    fun showImportSuccess()
+    fun showDownloadSuccess()
+    fun showError()
+    fun cancelProgressNotification()
+    fun hasActiveProgressNotification(): Boolean
+}

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

@@ -0,0 +1,65 @@
+package com.example.research.common.progress
+
+import com.example.research.core.util.OperationResult
+import com.example.research.data.repository.LocalDictionaryRepository
+import com.example.research.feature.download.repository.DictionaryRepository
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.first
+import java.io.File
+import kotlin.time.Duration.Companion.milliseconds
+
+interface PipelineTerminalUi {
+    fun showImportSuccess()
+    fun showDownloadSuccess()
+    fun showError()
+    fun cancelProgress()
+}
+
+interface ImportFlowOperations {
+    fun updateExtractionProgress(progress: Float)
+    fun markImportPipelineSuccess()
+    fun clearImportState()
+    fun getAndClearImportedFiles(): List<File>
+}
+
+interface ReindexingSteps {
+    suspend fun waitForIndexingCompletion(): Boolean
+    suspend fun extractArchives(onProgress: (Float) -> Unit)
+    suspend fun scanDirectory(path: String): OperationResult<Int>
+    suspend fun warmupIndexes()
+    suspend fun performAllCleanup()
+}
+
+class DefaultReindexingSteps(
+    private val localDictionaryRepository: LocalDictionaryRepository,
+    private val downloadDictionaryRepository: DictionaryRepository,
+) : ReindexingSteps {
+
+    override suspend fun waitForIndexingCompletion(): Boolean {
+        if (!localDictionaryRepository.indexingProgress.first().isIndexing) return true
+        var waitCount = 0
+        while (localDictionaryRepository.indexingProgress.first().isIndexing && waitCount < MAX_POLL) {
+            delay(POLL_INTERVAL)
+            waitCount++
+        }
+        return waitCount < MAX_POLL
+    }
+
+    override suspend fun extractArchives(onProgress: (Float) -> Unit) {
+        downloadDictionaryRepository.extractArchives(onProgress = onProgress)
+    }
+
+    override suspend fun scanDirectory(path: String): OperationResult<Int> =
+        localDictionaryRepository.scanDirectory(path)
+
+    override suspend fun warmupIndexes() = localDictionaryRepository.warmupIndexes()
+
+    override suspend fun performAllCleanup() {
+        downloadDictionaryRepository.performAllCleanup()
+    }
+
+    private companion object {
+        const val MAX_POLL = 100
+        val POLL_INTERVAL = 200.milliseconds
+    }
+}

app/src/main/java/com/example/research/common/util/NotificationHelper.kt

@@ -7,8 +7,9 @@ import androidx.core.app.*
 import androidx.core.content.ContextCompat
 import com.example.research.MainActivity
 import com.example.research.R
+import com.example.research.common.progress.NotificationPort
 import com.example.research.feature.download.receiver.DownloadCancelReceiver
-class NotificationHelper(private val context: Context) {
+class NotificationHelper(private val context: Context) : NotificationPort {
     companion object {
         const val CHANNEL_ID = "download_progress_channel"
         const val NOTIFICATION_ID = 1
@@ -64,6 +65,22 @@ class NotificationHelper(private val context: Context) {
             android.Manifest.permission.POST_NOTIFICATIONS
         ) == android.content.pm.PackageManager.PERMISSION_GRANTED
     }
+    override fun showProgress(percent: Int, titleRes: Int) {
+        showUnifiedProgressNotification(
+            title = context.getString(titleRes),
+            contentText = "$percent%",
+            progressPercent = percent,
+        )
+    }
+
+    override fun showDownloadSuccess() = showSuccessNotification()
+
+    override fun showImportSuccess() = showImportSuccessNotification()
+
+    override fun showError() = showErrorNotification()
+
+    override fun cancelProgressNotification() = cancelNotification()
+
     fun showSuccessNotification() {
         if (!canShowNotification()) return
         lastNotificationKey = 0
@@ -93,6 +110,8 @@ class NotificationHelper(private val context: Context) {
         notificationManager.cancel(NOTIFICATION_ID)
     }
 
+    override fun hasActiveProgressNotification(): Boolean = lastNotificationKey != 0
+
     fun showUnifiedProgressNotification(
         title: String,
         contentText: String,

app/src/main/java/com/example/research/core/domain/model/IndexingProgress.kt

@@ -1,6 +1,8 @@
 package com.example.research.core.domain.model
 import kotlin.math.roundToInt
 
+import androidx.compose.runtime.Immutable
+
 /**
  * Snapshot of an ongoing indexing operation.
  *
@@ -11,6 +13,7 @@ import kotlin.math.roundToInt
  * [perFileProgress] is kept for diagnostics; callers should prefer
  * [progress] / [progressPercent].
  */
+@Immutable
 data class IndexingProgress(
     val currentFile: String = "",
     val currentIndex: Int = 0,

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

@@ -25,6 +25,7 @@ class PreferencesManager(private val context: Context) {
         val IS_LANGUAGE_EXPANDED = booleanPreferencesKey("is_language_expanded")
         val IS_DICTIONARIES_EXPANDED = booleanPreferencesKey("is_dictionaries_expanded")
         val DISABLED_DICTIONARY_PATHS = stringSetPreferencesKey("disabled_dictionary_paths")
+        val HAD_NO_DICTIONARIES = booleanPreferencesKey("had_no_dictionaries")
     }
 
     private val json = Json { ignoreUnknownKeys = true }
@@ -67,6 +68,17 @@ class PreferencesManager(private val context: Context) {
             preferences[PreferencesKeys.DISABLED_DICTIONARY_PATHS] ?: emptySet()
         }
 
+    val hadNoDictionaries: Flow<Boolean> = context.dataStore.data
+        .map { preferences ->
+            preferences[PreferencesKeys.HAD_NO_DICTIONARIES] ?: true
+        }
+
+    suspend fun setHadNoDictionaries(value: Boolean) {
+        context.dataStore.edit { preferences ->
+            preferences[PreferencesKeys.HAD_NO_DICTIONARIES] = value
+        }
+    }
+
     suspend fun setDictionaryActive(path: String, isActive: Boolean) {
         context.dataStore.edit { preferences ->
             val disabledPaths = preferences[PreferencesKeys.DISABLED_DICTIONARY_PATHS]

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

@@ -46,9 +46,8 @@ class IndexEntryPagingSource(
 
     private data class EmittedKey(
         val dictPosition: Int,
-        val originalWord: String,
+        val word: String,
-        val offset: Long,
+        val offset: Long
-        val length: Int
     )
 
     private val emittedArticles = HashSet<EmittedKey>()
@@ -103,6 +102,7 @@ class IndexEntryPagingSource(
                 val normalizedQuery = query.sanitizeQuery().lowercase().trim()
                 val ranked = rawResults.map { it.second }
                     .rankBySearchRelevance(SearchRankingContext(normalizedQuery))
+                    .distinctBy { Triple(it.dictionaryPath, it.word, it.offset.value) }
 
                 rawResults.forEach { (position, entry) -> emittedArticles.add(entry.emittedKey(position)) }
 
@@ -184,7 +184,7 @@ class IndexEntryPagingSource(
     }
 
     private fun IndexEntry.emittedKey(dictPosition: Int) =
-        EmittedKey(dictPosition, originalWord, offset.value, length.value)
+        EmittedKey(dictPosition, word, offset.value)
 
     override fun getRefreshKey(state: PagingState<TailKey, IndexEntry>): TailKey? {
         return null

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

@@ -45,12 +45,6 @@ class IndexSearcher(private val context: Context) {
         val dataStartOffset: Long
     )
 
-    data class IndexComparisonSummary(
-        val expectedCount: Int,
-        val actualCount: Int,
-        val comparedCount: Int
-    )
-
     data class RangeCursor(
         val rangeQuery: String,
         val absoluteIndex: Int,
@@ -72,8 +66,6 @@ class IndexSearcher(private val context: Context) {
         val cursorAfter: RangeCursor?
     )
 
-    class IndexComparisonException(message: String) : IllegalStateException(message)
-
     suspend fun findFirstEntry(pathOrUri: String, query: String): IndexEntry? = withContext(Dispatchers.Default) {
         val normalizedQuery = query.sanitizeQuery().lowercase().trim()
         try {
@@ -244,99 +236,6 @@ class IndexSearcher(private val context: Context) {
         }
     }
 
-    suspend fun compareEntryGroups(
-        expectedIndexPath: String,
-        actualIndexPath: String,
-        onGroup: suspend (word: String, expected: List<IndexEntry>, actual: List<IndexEntry>) -> Unit
-    ): IndexComparisonSummary = withContext(Dispatchers.IO) {
-        val expectedMetadata = loadMetadata(expectedIndexPath)
-        val actualMetadata = loadMetadata(actualIndexPath)
-
-        if (expectedMetadata.totalCount != actualMetadata.totalCount) {
-            throw IndexComparisonException(
-                "Index entry count differs: expected=${expectedMetadata.totalCount}, " +
-                    "actual=${actualMetadata.totalCount}"
-            )
-        }
-
-        openSource(expectedIndexPath).use { expectedSource ->
-            openSource(actualIndexPath).use { actualSource ->
-                expectedSource.seek(expectedMetadata.dataStartOffset)
-                actualSource.seek(actualMetadata.dataStartOffset)
-
-                var expectedNext = readEntryOrNull(expectedSource, expectedMetadata, expectedMetadata.totalCount > 0)
-                var actualNext = readEntryOrNull(actualSource, actualMetadata, actualMetadata.totalCount > 0)
-                var comparedCount = 0
-
-                while (expectedNext != null && actualNext != null) {
-                    if (expectedNext.word != actualNext.word) {
-                        throw IndexComparisonException(
-                            "Index words differ at entry $comparedCount: " +
-                                "expected=${expectedNext.word}, actual=${actualNext.word}"
-                        )
-                    }
-
-                    val word = expectedNext.word
-                    val expectedGroup = mutableListOf<IndexEntry>()
-                    val actualGroup = mutableListOf<IndexEntry>()
-
-                    while (true) {
-                        val current = expectedNext ?: break
-                        if (current.word != word) break
-                        expectedGroup.add(current)
-                        comparedCount++
-                        expectedNext = readEntryOrNull(
-                            expectedSource,
-                            expectedMetadata,
-                            comparedCount < expectedMetadata.totalCount
-                        )
-                    }
-
-                    var actualReadCount = comparedCount - expectedGroup.size
-                    while (true) {
-                        val current = actualNext ?: break
-                        if (current.word != word) break
-                        actualGroup.add(current)
-                        actualReadCount++
-                        actualNext = readEntryOrNull(
-                            actualSource,
-                            actualMetadata,
-                            actualReadCount < actualMetadata.totalCount
-                        )
-                    }
-
-                    if (expectedGroup.size != actualGroup.size) {
-                        throw IndexComparisonException(
-                            "Headword multiplicity differs for '$word': " +
-                                "expected=${expectedGroup.size}, actual=${actualGroup.size}"
-                        )
-                    }
-
-                    onGroup(word, expectedGroup, actualGroup)
-                    if (comparedCount % 10_000 == 0) yield()
-                }
-
-                if (expectedNext != null || actualNext != null) {
-                    throw IndexComparisonException(
-                        "One index ended before the other at entry $comparedCount"
-                    )
-                }
-
-                IndexComparisonSummary(
-                    expectedCount = expectedMetadata.totalCount,
-                    actualCount = actualMetadata.totalCount,
-                    comparedCount = comparedCount
-                )
-            }
-        }
-    }
-
-    private fun readEntryOrNull(
-        source: RandomAccessSource,
-        metadata: IndexMetadata,
-        shouldRead: Boolean
-    ): IndexEntry? = if (shouldRead) readEntry(source, metadata) else null
-
     fun trimMemory(level: Int) {
         metadataCache.trim(level)
         resultsCache.trim(level)

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

@@ -27,9 +27,9 @@ import kotlinx.coroutines.awaitAll
 import kotlinx.coroutines.ensureActive
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.flow.update
-import kotlinx.coroutines.launch
 import kotlinx.coroutines.supervisorScope
 import kotlinx.coroutines.sync.Mutex
 import kotlinx.coroutines.sync.Semaphore
@@ -95,12 +95,10 @@ class LocalDictionaryRepository(
     override val coroutineContext = Job() + ioDispatcher
 
     private val mutableDictionaries = MutableStateFlow<List<Dictionary>>(emptyList())
-    val dictionaries: StateFlow<List<Dictionary>>
+    val dictionaries: StateFlow<List<Dictionary>> = mutableDictionaries.asStateFlow()
-        get() = mutableDictionaries
 
     private val mutableIndexingProgress = MutableStateFlow(IndexingProgress())
-    val indexingProgress: StateFlow<IndexingProgress>
+    val indexingProgress: StateFlow<IndexingProgress> = mutableIndexingProgress.asStateFlow()
-        get() = mutableIndexingProgress
 
     private val indexingMutex = Mutex()
     private val indexingSemaphore = Semaphore(1)
@@ -489,7 +487,7 @@ class LocalDictionaryRepository(
                 if (dictFile.exists() && !dictFile.delete()) {
                     return@withContext Pair(
                         "Failed to delete dictionary file: ${dictFile.absolutePath}",
-                        emptyList<String>(),
+                        emptyList(),
                     )
                 }
 

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

@@ -41,11 +41,21 @@ class DownloadManager(
         val clampedProgress = progress.coerceIn(0f, 1f)
         mutableDownloadProgressState.value = DownloadProgressState(state, clampedProgress)
         mutableDownloadState.value = state
+        if (state is DownloadState.Success) {
+            onDownloadSuccess?.invoke()
+        } else if (state is DownloadState.Error || state is DownloadState.Cancelled) {
+            onTerminal?.invoke(state)
+        }
     }
 
+    var onFlowStarted: (() -> Unit)? = null
+    var onDownloadSuccess: (() -> Unit)? = null
+    var onTerminal: ((DownloadState) -> Unit)? = null
+
     fun startDownload() {
         if (downloadState.value is DownloadState.Loading) return
         if (!downloadScope.isActive) return
+        onFlowStarted?.invoke()
         cancelCleanupJob = null
         downloadJob = downloadScope.launch {
             mutex.withLock {
@@ -58,7 +68,7 @@ class DownloadManager(
 
                     if (enabledSources.isEmpty()) {
                         dictionaryRepository.performAllCleanup()
-                        updateDownloadProgressState(DownloadState.Success, 1f)
+                        updateDownloadProgressState(DownloadState.Idle, 0f)
                         return@withLock
                     }
 
@@ -137,12 +147,13 @@ class DownloadManager(
     fun startDownloadForSources(sourceUrls: List<String>) {
         if (downloadState.value is DownloadState.Loading) return
         if (!downloadScope.isActive) return
+        onFlowStarted?.invoke()
         cancelCleanupJob = null
         downloadJob = downloadScope.launch {
             mutex.withLock {
                 try {
                     if (sourceUrls.isEmpty()) {
-                        updateDownloadProgressState(DownloadState.Success, 1f)
+                        updateDownloadProgressState(DownloadState.Idle, 0f)
                         return@withLock
                     }
 
@@ -153,7 +164,7 @@ class DownloadManager(
                     }
 
                     if (sources.isEmpty()) {
-                        updateDownloadProgressState(DownloadState.Success, 1f)
+                        updateDownloadProgressState(DownloadState.Idle, 0f)
                         return@withLock
                     }
 

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

@@ -1,4 +1,8 @@
 package com.example.research.feature.download.model
+
+import androidx.compose.runtime.Immutable
+
+@Immutable
 sealed class DownloadState {
     data object Idle : DownloadState()
     data object Loading : DownloadState()
@@ -7,3 +11,6 @@ sealed class DownloadState {
     data class Error(val message: String) : DownloadState()
     data object Cancelled : DownloadState()
 }
+
+val DownloadState.isActive: Boolean
+    get() = this is DownloadState.Loading || this is DownloadState.Extracting || this is DownloadState.Success

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

@@ -3,19 +3,19 @@ package com.example.research.feature.download.service
 import android.app.Service
 import android.content.Intent
 import android.os.IBinder
-import android.util.Log
 import androidx.core.app.ServiceCompat
 import com.example.research.ReSearchApplication
-import com.example.research.common.progress.renderTitle
+import com.example.research.common.progress.DictionaryPipelineCoordinator
+import com.example.research.common.progress.DictionaryProgressPresenter
 import com.example.research.common.util.NotificationHelper
-import com.example.research.core.util.OperationResult
 import com.example.research.data.repository.LocalDictionaryRepository
 import com.example.research.feature.download.DownloadManager
-import com.example.research.feature.download.model.DownloadState
+import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.*
+import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.flow.*
+import kotlinx.coroutines.SupervisorJob
-import kotlin.time.Duration.Companion.milliseconds
+import kotlinx.coroutines.cancel
-import kotlin.time.Duration.Companion.seconds
+import kotlinx.coroutines.cancelChildren
+import kotlinx.coroutines.Job
 
 class DictionaryForegroundService : Service() {
 
@@ -23,21 +23,21 @@ class DictionaryForegroundService : Service() {
         const val ACTION_START = "com.example.research.START_DOWNLOAD"
         const val ACTION_STOP = "com.example.research.STOP_DOWNLOAD"
         const val ACTION_IMPORT = "com.example.research.START_IMPORT"
+        const val ACTION_FINISH = "com.example.research.FINISH_PIPELINE"
         private const val NOTIFICATION_ID = NotificationHelper.NOTIFICATION_ID
     }
 
     private lateinit var downloadManager: DownloadManager
     private lateinit var localDictionaryRepository: LocalDictionaryRepository
     private lateinit var dictionaryImportManager: com.example.research.feature.import.DictionaryImportManager
-    private lateinit var progressStateHolder: com.example.research.common.progress.DictionaryProgressStateHolder
+    private lateinit var pipelineCoordinator: DictionaryPipelineCoordinator
+    private lateinit var presenter: DictionaryProgressPresenter
     private val notificationHelper by lazy {
         NotificationHelper(this)
     }
 
     private val serviceScope = CoroutineScope(SupervisorJob() + Dispatchers.Main)
     @Volatile
-    private var isHandlingSuccess = false
-    @Volatile
     private var latestStartId = 0
 
     override fun onCreate() {
@@ -47,164 +47,8 @@ class DictionaryForegroundService : Service() {
         downloadManager = app.downloadManager
         localDictionaryRepository = app.localDictionaryRepository
         dictionaryImportManager = app.dictionaryImportManager
-        progressStateHolder = app.dictionaryProgressStateHolder
+        pipelineCoordinator = app.dictionaryPipelineCoordinator
-        observeDownloadState()
+        presenter = app.dictionaryProgressPresenter
-        observeImportState()
-        observeUnifiedProgress()
-    }
-
-    private fun observeDownloadState() {
-        serviceScope.launch {
-            downloadManager.downloadState.collect { state ->
-                when (state) {
-                    is DownloadState.Success -> handleSuccess()
-                    is DownloadState.Error -> {
-                        notificationHelper.showErrorNotification()
-                        stopForegroundService(removeNotification = false)
-                    }
-                    is DownloadState.Cancelled -> {
-                        notificationHelper.cancelNotification()
-                        stopForegroundService()
-                    }
-                    else -> {}
-                }
-            }
-        }
-    }
-
-    private fun observeImportState() {
-        serviceScope.launch {
-            dictionaryImportManager.importState.collect { state ->
-                when (state) {
-                    is com.example.research.ui.settings.ImportState.Success -> handleSuccess()
-                    is com.example.research.ui.settings.ImportState.Error -> {
-                        notificationHelper.showErrorNotification()
-                        stopForegroundService(removeNotification = false)
-                    }
-                    else -> {}
-                }
-            }
-        }
-    }
-
-    private fun observeUnifiedProgress() {
-        serviceScope.launch {
-            progressStateHolder.progressSnapshot
-                .collect { snapshot ->
-                    if (snapshot != null) {
-                        notificationHelper.showUnifiedProgressNotification(
-                            title = snapshot.renderTitle(this@DictionaryForegroundService),
-                            contentText = "${snapshot.percent}%",
-                            progressPercent = snapshot.percent,
-                        )
-                    }
-                }
-        }
-    }
-
-    private suspend fun triggerReindexing(isImportFlow: Boolean) = withContext(Dispatchers.IO) {
-        try {
-            waitForIndexingCompletion()
-            delay(1.seconds)
-
-            val app = application as? ReSearchApplication
-                ?: return@withContext
-            val path = app.preferencesManager.dictionaryPath
-            if (isImportFlow) {
-                dictionaryImportManager.updateExtractionProgress(0f)
-            }
-            app.downloadDictionaryRepository.extractArchives(onProgress = { progress ->
-                if (isImportFlow) {
-                    dictionaryImportManager.updateExtractionProgress(progress)
-                }
-            })
-            val result = localDictionaryRepository.scanDirectory(path)
-            if (result is OperationResult.Success && result.data > 0) {
-                localDictionaryRepository.warmupIndexes()
-                app.downloadDictionaryRepository.performAllCleanup()
-            }
-            if (isImportFlow) {
-                dictionaryImportManager.markImportPipelineSuccess()
-            }
-        } catch (e: CancellationException) {
-            throw e
-        } catch (e: Exception) {
-            Log.e("DictionaryForegroundService", "triggerReindexing() failed: ${e.message}", e)
-        }
-    }
-
-    private suspend fun waitForIndexingCompletion(): Boolean {
-        val isIndexing = localDictionaryRepository.indexingProgress.first().isIndexing
-
-        if (!isIndexing) {
-            return true
-        }
-
-        var waitCount = 0
-        while (localDictionaryRepository.indexingProgress.first().isIndexing && waitCount < 100) {
-            delay(200.milliseconds)
-            waitCount++
-        }
-
-        return waitCount < 100
-    }
-
-    private fun handleSuccess() {
-        if (isHandlingSuccess) return
-        isHandlingSuccess = true
-        serviceScope.launch {
-            try {
-                val isImportFlow = dictionaryImportManager.importState.value !is com.example.research.ui.settings.ImportState.Idle
-
-                if (isImportFlow) {
-                    val app = application as? ReSearchApplication
-                    val path = app?.preferencesManager?.dictionaryPath
-                    val dictionariesDir = path?.let { java.io.File(it) }
-                    val filesBeforeReindex = dictionariesDir?.listFiles()?.map { it.name }?.toSet() ?: emptySet()
-
-                    try {
-                        triggerReindexing(true)
-                        dictionaryImportManager.getAndClearImportedFiles()
-                    } catch (e: CancellationException) {
-                        val filesToCleanup = dictionaryImportManager.getAndClearImportedFiles()
-                        filesToCleanup.forEach { file ->
-                            try { if (file.exists()) file.delete() } catch (_: Exception) { /* Ignore cleanup failure */ }
-                        }
-                        if (dictionariesDir != null) {
-                            cleanupNewFiles(dictionariesDir, filesBeforeReindex)
-                        }
-                        throw e
-                    }
-                } else {
-                    triggerReindexing(false)
-                }
-
-                if (isImportFlow) {
-                    notificationHelper.showImportSuccessNotification()
-                    dictionaryImportManager.clearImportState()
-                } else {
-                    notificationHelper.showSuccessNotification()
-                }
-            } catch (e: Exception) {
-                if (e !is CancellationException) {
-                    Log.e("DownloadForegroundService", "handleSuccess() failed: ${e.message}", e)
-                    notificationHelper.showErrorNotification()
-                }
-            } finally {
-                isHandlingSuccess = false
-                stopForegroundService(removeNotification = false)
-            }
-        }
-    }
-
-    private fun cleanupNewFiles(dir: java.io.File, filesBeforeSnapshot: Set<String>) {
-        try {
-            dir.listFiles()?.forEach { file ->
-                if (file.name !in filesBeforeSnapshot) {
-                    try { file.delete() } catch (_: Exception) { /* Ignore delete failure */ }
-                }
-            }
-        } catch (_: Exception) { /* Ignore directory listing failure */ }
     }
 
     private fun startForegroundService() {
@@ -249,15 +93,20 @@ class DictionaryForegroundService : Service() {
     }
 
     private fun stopForTimeout(startId: Int) {
+        cancelAllWork()
+        ServiceCompat.stopForeground(this, ServiceCompat.STOP_FOREGROUND_REMOVE)
+        stopSelfResult(startId)
+    }
+
+    private fun cancelAllWork() {
         serviceScope.coroutineContext[Job]?.cancelChildren()
+        pipelineCoordinator.cancelPipeline()
         if (localDictionaryRepository.isIndexingInProgress()) {
             localDictionaryRepository.cancelIndexing()
         }
         downloadManager.cancelDownload()
         dictionaryImportManager.cancelImport()
-        notificationHelper.cancelNotification()
+        presenter.cancelProgress()
-        ServiceCompat.stopForeground(this, ServiceCompat.STOP_FOREGROUND_REMOVE)
-        stopSelfResult(startId)
     }
 
     override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
@@ -275,21 +124,16 @@ class DictionaryForegroundService : Service() {
             ACTION_IMPORT -> {
                 startForegroundService()
             }
+            ACTION_FINISH -> {
+                stopForegroundService(removeNotification = false)
+            }
             ACTION_STOP -> {
                 try {
                     startForegroundService()
                 } catch (_: Exception) {
                     // Service may already be stopped
                 }
-                serviceScope.coroutineContext[Job]?.cancelChildren()
+                cancelAllWork()
-
-                if (localDictionaryRepository.isIndexingInProgress()) {
-                    localDictionaryRepository.cancelIndexing()
-                }
-
-                downloadManager.cancelDownload()
-                dictionaryImportManager.cancelImport()
-                notificationHelper.cancelNotification()
                 stopForegroundService()
             }
         }

app/src/main/java/com/example/research/feature/import/DictionaryImportManager.kt

@@ -3,6 +3,7 @@ package com.example.research.feature.import
 import android.app.Application
 import android.net.Uri
 import com.example.research.R
+import com.example.research.common.progress.ImportFlowOperations
 import com.example.research.common.util.SafeFileName
 import com.example.research.core.performance.ReSearchTrace
 import com.example.research.ui.settings.ImportState
@@ -14,16 +15,19 @@ import java.util.Collections
 
 class DictionaryImportManager(
     private val application: Application
-) {
+) : ImportFlowOperations {
     private val mutableImportState = MutableStateFlow<ImportState>(ImportState.Idle)
     val importState: StateFlow<ImportState> = mutableImportState.asStateFlow()
 
     private val managerScope = CoroutineScope(SupervisorJob() + Dispatchers.Main)
     private var importJob: Job? = null
     private val importedFiles = Collections.synchronizedList(mutableListOf<File>())
+    var onFlowStarted: (() -> Unit)? = null
+    var onTerminal: ((ImportState) -> Unit)? = null
 
     fun importDictionaries(uris: List<Uri>) {
         importJob?.cancel()
+        onFlowStarted?.invoke()
         importJob = managerScope.launch {
             mutableImportState.value = ImportState.Idle
             performImport(uris)
@@ -36,6 +40,8 @@ class DictionaryImportManager(
         val dictionariesDir = File(context.getExternalFilesDir(null), "dictionaries")
         val totalFiles = uris.size.coerceAtLeast(1)
         importedFiles.clear()
+        val skippedNames = mutableListOf<String>()
+        val deferredErrors = mutableListOf<String>()
 
         if (!dictionariesDir.exists()) {
             dictionariesDir.mkdirs()
@@ -46,9 +52,7 @@ class DictionaryImportManager(
                 currentCoroutineContext().ensureActive()
                 val fileName = getFileName(uri) ?: continue
                 if (SafeFileName.validate(fileName) == null) {
-                    mutableImportState.value = ImportState.Error(
+                    deferredErrors += context.getString(R.string.import_invalid_file_name, fileName)
-                        context.getString(R.string.import_invalid_file_name, fileName)
-                    )
                     continue
                 }
                 val lowerFileName = fileName.lowercase()
@@ -65,9 +69,7 @@ class DictionaryImportManager(
                 val destFile = File(dictionariesDir, fileName)
 
                 if (destFile.exists()) {
-                    mutableImportState.value = ImportState.Error(
+                    skippedNames += fileName
-                        context.getString(R.string.import_file_exists, fileName)
-                    )
                     continue
                 }
 
@@ -115,16 +117,30 @@ class DictionaryImportManager(
 
             currentCoroutineContext().ensureActive()
 
-            mutableImportState.value = ImportState.Success
+            val terminalState = resolveImportOutcome(
+                importedCount = importedFiles.size,
+                skippedNames = skippedNames,
+                deferredErrors = deferredErrors,
+            ).toImportState(
+                existsMessage = { names ->
+                    context.getString(R.string.import_file_exists, names.joinToString(separator = ", "))
+                },
+                invalidMessage = { message -> message },
+                nothingImportedMessage = { context.getString(R.string.import_nothing_imported) },
+            )
+            mutableImportState.value = terminalState
+            onTerminal?.invoke(terminalState)
 
         } catch (e: CancellationException) {
             cleanupImportedFiles()
             mutableImportState.value = ImportState.Idle
             throw e
         } catch (e: Exception) {
-            mutableImportState.value = ImportState.Error(
+            val errorState = ImportState.Error(
                 context.getString(R.string.import_error, e.message ?: "Unknown error")
             )
+            mutableImportState.value = errorState
+            onTerminal?.invoke(errorState)
         }
         }
 
@@ -154,18 +170,18 @@ class DictionaryImportManager(
         return size
     }
 
-    fun clearImportState() {
+    override fun clearImportState() {
         mutableImportState.value = ImportState.Idle
     }
 
-    fun updateExtractionProgress(progress: Float) {
+    override fun updateExtractionProgress(progress: Float) {
         mutableImportState.update { current ->
             if (current is ImportState.Idle || current is ImportState.Error) current
             else ImportState.Extracting(progress.coerceIn(0f, 1f))
         }
     }
 
-    fun markImportPipelineSuccess() {
+    override fun markImportPipelineSuccess() {
         mutableImportState.update { current ->
             if (current is ImportState.Idle || current is ImportState.Error) current
             else ImportState.Success
@@ -179,7 +195,7 @@ class DictionaryImportManager(
         mutableImportState.value = ImportState.Idle
     }
 
-    fun getAndClearImportedFiles(): List<File> {
+    override fun getAndClearImportedFiles(): List<File> {
         val files = importedFiles.toList()
         importedFiles.clear()
         return files

app/src/main/java/com/example/research/feature/import/ImportOutcome.kt

@@ -0,0 +1,32 @@
+package com.example.research.feature.import
+
+import com.example.research.ui.settings.ImportState
+
+internal sealed interface ImportOutcome {
+    data object Imported : ImportOutcome
+    data class AlreadyExists(val names: List<String>) : ImportOutcome
+    data class InvalidFile(val message: String) : ImportOutcome
+    data object NothingImported : ImportOutcome
+}
+
+internal fun resolveImportOutcome(
+    importedCount: Int,
+    skippedNames: List<String>,
+    deferredErrors: List<String>,
+): ImportOutcome = when {
+    importedCount > 0 -> ImportOutcome.Imported
+    skippedNames.isNotEmpty() -> ImportOutcome.AlreadyExists(skippedNames)
+    deferredErrors.isNotEmpty() -> ImportOutcome.InvalidFile(deferredErrors.first())
+    else -> ImportOutcome.NothingImported
+}
+
+internal fun ImportOutcome.toImportState(
+    existsMessage: (List<String>) -> String,
+    invalidMessage: (String) -> String,
+    nothingImportedMessage: () -> String,
+): ImportState = when (this) {
+    ImportOutcome.Imported -> ImportState.Success
+    is ImportOutcome.AlreadyExists -> ImportState.Error(existsMessage(names))
+    is ImportOutcome.InvalidFile -> ImportState.Error(invalidMessage(message))
+    ImportOutcome.NothingImported -> ImportState.Error(nothingImportedMessage())
+}

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

@@ -78,6 +78,4 @@ internal object AboutLibrariesParser {
         context.resources.openRawResource(resourceId)
             .bufferedReader()
             .use { reader -> json.decodeFromString(reader.readText()) }
-
-    fun decode(source: String): AboutLibrariesData = json.decodeFromString(source)
 }

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

@@ -1,6 +1,5 @@
 package com.example.research.ui.about
 
-import androidx.compose.animation.animateContentSize
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.ExperimentalLayoutApi
@@ -27,6 +26,7 @@ import androidx.compose.material3.TopAppBarDefaults
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.produceState
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
@@ -43,6 +43,8 @@ import androidx.compose.ui.unit.dp
 import com.example.research.R
 import com.example.research.common.ui.components.OutlinedChoiceButton
 import com.example.research.ui.theme.AppWindowInsets
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
 
 @OptIn(ExperimentalMaterial3Api::class, ExperimentalLayoutApi::class)
 @Composable
@@ -57,8 +59,10 @@ fun AboutScreen(
     }
     val versionName = packageInfo?.versionName ?: stringResource(R.string.version_unknown)
     val uriHandler = LocalUriHandler.current
-    val librariesData = remember(context) {
+    val librariesData by produceState<AboutLibrariesData?>(initialValue = null, context) {
-        AboutLibrariesParser.read(context, R.raw.aboutlibraries)
+        value = withContext(Dispatchers.IO) {
+            AboutLibrariesParser.read(context, R.raw.aboutlibraries)
+        }
     }
     var expandedLibraryId by remember { mutableStateOf<String?>(null) }
     var dialogLicense by remember { mutableStateOf<AboutLicense?>(null) }
@@ -93,12 +97,12 @@ fun AboutScreen(
                 AboutHeader(versionName = versionName)
             }
             items(
-                items = librariesData.libraries,
+                items = librariesData?.libraries.orEmpty(),
                 key = AboutLibrary::uniqueId,
             ) { library ->
                 AboutLibraryRow(
                     library = library,
-                    licenses = librariesData.licenses,
+                    licenses = librariesData?.licenses.orEmpty(),
                     expanded = expandedLibraryId == library.uniqueId,
                     onToggle = {
                         expandedLibraryId = if (expandedLibraryId == library.uniqueId) {
@@ -191,8 +195,7 @@ private fun AboutLibraryRow(
     ) {
         Column(
             modifier = Modifier
-                .padding(horizontal = 16.dp, vertical = 12.dp)
+                .padding(horizontal = 16.dp, vertical = 12.dp),
-                .animateContentSize(),
             verticalArrangement = Arrangement.spacedBy(5.dp)
         ) {
             Row(

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

@@ -41,6 +41,7 @@ fun SearchResultsList(
     ) {
         items(
             count = results.itemCount,
+            key = results.itemKey { "${it.dictionaryPath}:${it.offset.value}:${it.word}" },
             contentType = results.itemContentType { "search_result" }
         ) { index ->
             results[index]?.let { entry ->

app/src/main/java/com/example/research/ui/navigation/AppNavigation.kt

@@ -2,22 +2,18 @@ package com.example.research.ui.navigation
 
 import androidx.activity.compose.BackHandler
 import androidx.compose.material3.adaptive.ExperimentalMaterial3AdaptiveApi
-import androidx.compose.material3.adaptive.currentWindowAdaptiveInfo
+import androidx.compose.material3.adaptive.currentWindowAdaptiveInfoV2
 import androidx.compose.runtime.*
 import androidx.compose.runtime.saveable.*
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import androidx.window.core.layout.WindowSizeClass.Companion.WIDTH_DP_MEDIUM_LOWER_BOUND
 import com.example.research.feature.search.SearchAction
 import com.example.research.feature.search.SearchViewModel
-import com.example.research.feature.download.model.DownloadState
 import com.example.research.ui.about.AboutScreen
 import com.example.research.ui.article.ArticleRoute
 import com.example.research.ui.main.MainRoute
-import com.example.research.ui.settings.ImportState
 import com.example.research.ui.settings.SettingsRoute
 import com.example.research.ui.settings.SettingsViewModel
-import kotlinx.coroutines.delay
-import kotlin.time.Duration.Companion.milliseconds
 
 private data class NavigationState(
     val shouldShowSettings: Boolean,
@@ -33,7 +29,8 @@ enum class Screen {
 @Composable
 fun AppNavigation(
     searchViewModel: SearchViewModel,
-    settingsViewModel: SettingsViewModel
+    settingsViewModel: SettingsViewModel,
+    seedNoDictionaries: Boolean = false
 ) {
     val screenStack = rememberSaveable(
         saver = listSaver(
@@ -53,39 +50,15 @@ fun AppNavigation(
     val currentScreen = screenStack.lastOrNull() ?: Screen.Home
 
     val settingsState by settingsViewModel.uiState.collectAsStateWithLifecycle()
-    val progressSnapshot by settingsViewModel.progressSnapshot.collectAsStateWithLifecycle()
-    val isPipelineActiveByState = remember(
-        progressSnapshot,
-        settingsState.indexingProgress.isIndexing,
-        settingsState.downloadState,
-        settingsState.importState,
-    ) {
-        progressSnapshot != null ||
-            settingsState.indexingProgress.isIndexing ||
-            settingsState.downloadState is DownloadState.Loading ||
-            settingsState.downloadState is DownloadState.Extracting ||
-            settingsState.downloadState is DownloadState.Success ||
-            settingsState.importState is ImportState.Importing ||
-            settingsState.importState is ImportState.Extracting ||
-            settingsState.importState is ImportState.Success
-    }
-    var stickyPipelineActive by rememberSaveable { mutableStateOf(false) }
-    LaunchedEffect(isPipelineActiveByState) {
-        if (isPipelineActiveByState) {
-            stickyPipelineActive = true
-        } else {
-            delay(1500.milliseconds)
-            stickyPipelineActive = false
-        }
-    }
 
     val navState by remember {
         derivedStateOf {
-            val isOperationActive = stickyPipelineActive
+            val isOperationActive = !settingsState.pipelineIdle
             val hasConfirmedNoDictionaries =
                 settingsState.hasCompletedStartupScan && settingsState.dictionaries.isEmpty()
+            val hasSeededNoDictionaries = seedNoDictionaries && !settingsState.hasCompletedStartupScan
             NavigationState(
-                shouldShowSettings = hasConfirmedNoDictionaries || isOperationActive,
+                shouldShowSettings = hasConfirmedNoDictionaries || hasSeededNoDictionaries || isOperationActive,
                 showBackButtonInSettings = settingsState.dictionaries.isNotEmpty() && !isOperationActive,
                 isOperationActive = isOperationActive,
             )
@@ -95,7 +68,7 @@ fun AppNavigation(
     val shouldShowSettings = navState.shouldShowSettings
     val showBackButtonInSettings = navState.showBackButtonInSettings
     val isOperationActive = navState.isOperationActive
-    val isWideScreen = currentWindowAdaptiveInfo()
+    val isWideScreen = currentWindowAdaptiveInfoV2()
         .windowSizeClass
         .isWidthAtLeastBreakpoint(WIDTH_DP_MEDIUM_LOWER_BOUND)
 

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

@@ -1,5 +1,8 @@
 package com.example.research.ui.settings
 
+import androidx.compose.runtime.Immutable
+
+@Immutable
 sealed interface ImportState {
     data object Idle : ImportState
     data class Importing(val progress: Float) : ImportState
@@ -7,3 +10,6 @@ sealed interface ImportState {
     data object Success : ImportState
     data class Error(val message: String) : ImportState
 }
+
+val ImportState.isActive: Boolean
+    get() = this is ImportState.Importing || this is ImportState.Extracting || this is ImportState.Success

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

@@ -1,6 +1,7 @@
 package com.example.research.ui.settings
 
 import android.net.Uri
+import androidx.compose.runtime.Immutable
 import com.example.research.core.domain.model.AppTheme
 import com.example.research.core.domain.model.Dictionary
 import com.example.research.core.domain.model.DictionarySource
@@ -8,6 +9,7 @@ import com.example.research.core.domain.model.IndexingProgress
 import com.example.research.DictionaryStatus
 import com.example.research.feature.download.model.DownloadState
 
+@Immutable
 data class SettingsUiState(
     val theme: AppTheme = AppTheme.SYSTEM,
     val language: String = "system",
@@ -21,6 +23,7 @@ data class SettingsUiState(
     val importState: ImportState = ImportState.Idle,
     val dictionarySources: List<DictionarySource> = emptyList(),
     val hasCompletedStartupScan: Boolean = false,
+    val pipelineIdle: Boolean = true,
     val appVersion: String = "1.0",
 )
 

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

@@ -19,6 +19,7 @@ import com.example.research.data.local.preferences.PreferencesManager
 import com.example.research.data.repository.LocalDictionaryRepository
 import com.example.research.feature.download.DownloadManager
 import com.example.research.feature.download.model.DownloadState
+import com.example.research.feature.download.model.isActive
 import com.example.research.feature.download.repository.DictionaryRepository
 import com.example.research.feature.import.DictionaryImportManager
 import kotlinx.coroutines.Dispatchers
@@ -89,9 +90,20 @@ class SettingsViewModel(
 
     init {
         setupStateObservation()
+        observeDictionariesForSeedFlag()
         initialize()
     }
 
+    private fun observeDictionariesForSeedFlag() {
+        viewModelScope.launch {
+            localDictionaryRepository.dictionaries.collect { dictionaries ->
+                if (hasCompletedStartupScan.value) {
+                    preferencesManager.setHadNoDictionaries(dictionaries.isEmpty())
+                }
+            }
+        }
+    }
+
     private fun setupStateObservation() {
         viewModelScope.launch {
             var wasIndexing = false
@@ -214,6 +226,9 @@ class SettingsViewModel(
                     importState = operationState.importState,
                     dictionaryStatus = operationState.dictionaryStatus,
                     hasCompletedStartupScan = operationState.hasCompletedStartupScan,
+                    pipelineIdle = !isIndexing &&
+                        !operationState.downloadState.isActive &&
+                        !operationState.importState.isActive,
                     isThemeExpanded = operationState.isThemeExpanded,
                     isLanguageExpanded = operationState.isLanguageExpanded,
                     isDictionariesExpanded = operationState.isDictionariesExpanded,
@@ -245,6 +260,9 @@ class SettingsViewModel(
                     android.util.Log.w("SettingsViewModel", "Failed to load language preference: ${e.message}")
                 }
                 hasCompletedStartupScan.value = true
+                preferencesManager.setHadNoDictionaries(
+                    localDictionaryRepository.dictionaries.value.isEmpty()
+                )
             }
         }
     }

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

@@ -28,6 +28,7 @@ import androidx.compose.runtime.remember
 import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.rememberUpdatedState
 import androidx.compose.runtime.setValue
+import androidx.compose.runtime.snapshotFlow
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clipToBounds
@@ -83,7 +84,7 @@ fun DictionaryListItem(
     onToggle: () -> Unit,
     onDelete: () -> Unit,
     modifier: Modifier = Modifier,
-    canDelete: Boolean = true
+    isDeleteBlocked: () -> Boolean = { false }
 ) {
     val haptic = LocalHapticFeedback.current
     val density = LocalDensity.current
@@ -95,8 +96,9 @@ fun DictionaryListItem(
     val offsetAnim = remember { Animatable(0f) }
 
     var rawOffset by remember { mutableFloatStateOf(0f) }
-    val isDeleteRevealed by remember(canDelete) {
+    val isDeleteBlockedCurrent by rememberUpdatedState(isDeleteBlocked)
-        derivedStateOf { canDelete && rawOffset <= -swipeThresholdPx }
+    val isDeleteRevealed by remember {
+        derivedStateOf { !isDeleteBlockedCurrent() && rawOffset <= -swipeThresholdPx }
     }
 
     LaunchedEffect(isDeleteRevealed) {
@@ -105,11 +107,14 @@ fun DictionaryListItem(
         }
     }
 
-    LaunchedEffect(canDelete) {
+    LaunchedEffect(Unit) {
-        if (!canDelete) {
+        snapshotFlow { isDeleteBlockedCurrent() }
-            rawOffset = 0f
+            .collect { blocked ->
-            offsetAnim.snapTo(0f)
+                if (blocked) {
-        }
+                    offsetAnim.snapTo(0f)
+                    rawOffset = 0f
+                }
+            }
     }
 
     val currentOnDelete by rememberUpdatedState(onDelete)
@@ -142,16 +147,18 @@ fun DictionaryListItem(
                 .height(DictionaryItemHeight)
                 .background(MaterialTheme.colorScheme.surfaceVariant)
                 .graphicsLayer { translationX = offsetAnim.value }
-                .pointerInput(canDelete, maxSwipePx, swipeThresholdPx) {
+                .pointerInput(maxSwipePx, swipeThresholdPx) {
-                    if (!canDelete) return@pointerInput
                     detectHorizontalDragGestures(
                         onDragStart = {
+                            if (isDeleteBlockedCurrent()) return@detectHorizontalDragGestures
                             haptic.performHapticFeedback(HapticFeedbackType.TextHandleMove)
                         },
                         onDragEnd = {
+                            if (isDeleteBlockedCurrent()) return@detectHorizontalDragGestures
                             val target = if (rawOffset <= -swipeThresholdPx) -maxSwipePx else 0f
                             rawOffset = target
                             scope.launch {
+                                if (isDeleteBlockedCurrent()) return@launch
                                 offsetAnim.animateTo(
                                     target,
                                     animationSpec = spring(stiffness = Spring.StiffnessMedium)
@@ -159,9 +166,11 @@ fun DictionaryListItem(
                             }
                         },
                         onDragCancel = {
+                            if (isDeleteBlockedCurrent()) return@detectHorizontalDragGestures
                             val target = if (rawOffset <= -swipeThresholdPx) -maxSwipePx else 0f
                             rawOffset = target
                             scope.launch {
+                                if (isDeleteBlockedCurrent()) return@launch
                                 offsetAnim.animateTo(
                                     target,
                                     animationSpec = spring(stiffness = Spring.StiffnessMedium)
@@ -169,9 +178,13 @@ fun DictionaryListItem(
                             }
                         },
                         onHorizontalDrag = { _, dragAmount ->
+                            if (isDeleteBlockedCurrent()) return@detectHorizontalDragGestures
                             val newOffset = (rawOffset + dragAmount).coerceIn(-maxSwipePx, 0f)
                             rawOffset = newOffset
-                            scope.launch { offsetAnim.snapTo(newOffset) }
+                            scope.launch {
+                                if (isDeleteBlockedCurrent()) return@launch
+                                offsetAnim.snapTo(newOffset)
+                            }
                         }
                     )
                 },
@@ -263,8 +276,10 @@ fun DictionaryListItem(
                 onClick = {
                     haptic.performHapticFeedback(HapticFeedbackType.TextHandleMove)
                     currentOnDelete()
-                    scope.launch { offsetAnim.snapTo(0f) }
+                    scope.launch {
-                    rawOffset = 0f
+                        offsetAnim.snapTo(0f)
+                        rawOffset = 0f
+                    }
                 },
                 modifier = Modifier
                     .align(Alignment.CenterEnd)

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

@@ -11,8 +11,10 @@ import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.derivedStateOf
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.key
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberUpdatedState
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.hapticfeedback.HapticFeedbackType
@@ -21,6 +23,7 @@ import androidx.compose.ui.platform.LocalFocusManager
 import androidx.compose.ui.platform.LocalHapticFeedback
 import androidx.compose.ui.res.pluralStringResource
 import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.semantics.invisibleToUser
 import androidx.compose.ui.semantics.semantics
 import androidx.compose.ui.unit.dp
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
@@ -75,6 +78,13 @@ fun DictionaryManagement(
         derivedStateOf { importState is ImportState.Importing || importState is ImportState.Extracting }
     }
     val hasEnabledSources by remember(sources) { derivedStateOf { sources.any { it.isEnabled } } }
+    val isBlockingMutations = isInProgress
+
+    // 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
+    // (e.g. Modifier.alpha(if (isDeleteBlocked()) ...)) would invalidate every row on each flip.
+    val isMutationsBlockedState = rememberUpdatedState(isBlockingMutations)
+    val isDeleteBlocked = remember { { isMutationsBlockedState.value } }
 
     SectionCard(
         modifier = modifier
@@ -125,13 +135,13 @@ fun DictionaryManagement(
 
                     // Disable accessibility on background content during import to improve performance.
                     // The progress dialog remains accessible for cancellation.
-                    val backgroundModifier = if (isInProgress) {
+                    val backgroundModifier = if (isBlockingMutations) {
-                        Modifier.semantics(mergeDescendants = true) { }
+                        Modifier.semantics { invisibleToUser() }
                     } else {
                         Modifier
                     }
 
-                    if (dictionaries.isEmpty() && !isInProgress) {
+                    if (dictionaries.isEmpty() && !isBlockingMutations) {
                         Column(
                             modifier = backgroundModifier
                                 .fillMaxWidth()
@@ -153,7 +163,7 @@ fun DictionaryManagement(
                             )
                         }
                     } else {
-                        if (dictionaryStatus is DictionaryStatus.NeedsUpdate && !isInProgress && hasEnabledSources) {
+                        if (dictionaryStatus is DictionaryStatus.NeedsUpdate && !isBlockingMutations && hasEnabledSources) {
                             DictionaryUpdateCard(
                                 onStartDownload = onStartDownload,
                                 modifier = backgroundModifier
@@ -167,10 +177,10 @@ fun DictionaryManagement(
                             modifier = Modifier
                                 .fillMaxWidth()
                                 .then(backgroundModifier),
-                            canDelete = !isInProgress
+                            isDeleteBlocked = isDeleteBlocked
                         )
 
-                        if (!isInProgress) {
+                        if (!isBlockingMutations) {
                             DictionaryActionButtons(
                                 onAddSource = {
                                     haptic.performHapticFeedback(HapticFeedbackType.TextHandleMove)
@@ -248,19 +258,21 @@ private fun DictionaryListSection(
     onToggleDictionary: (String) -> Unit,
     onDeleteDictionary: (Dictionary) -> Unit,
     modifier: Modifier = Modifier,
-    canDelete: Boolean = true
+    isDeleteBlocked: () -> Boolean = { false }
 ) {
     Column(
         modifier = modifier,
         verticalArrangement = Arrangement.spacedBy(4.dp)
     ) {
         dictionaries.forEach { dictionary ->
-            DictionaryListItem(
+            key(dictionary.path) {
-                dictionary = dictionary,
+                DictionaryListItem(
-                onToggle = { onToggleDictionary(dictionary.path) },
+                    dictionary = dictionary,
-                onDelete = { onDeleteDictionary(dictionary) },
+                    onToggle = { onToggleDictionary(dictionary.path) },
-                canDelete = canDelete
+                    onDelete = { onDeleteDictionary(dictionary) },
-            )
+                    isDeleteBlocked = isDeleteBlocked
+                )
+            }
         }
     }
 }

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

@@ -41,6 +41,11 @@ fun DictionaryProgressSection(
         var displayedPercent by remember { mutableIntStateOf(percent) }
         var displayedTestTag by remember { mutableStateOf(testTag) }
 
+        LaunchedEffect(visible) {
+            if (visible) {
+                monotonicTargetProgress = targetProgress
+            }
+        }
         LaunchedEffect(visible, targetProgress) {
             if (visible) {
                 monotonicTargetProgress = maxOf(monotonicTargetProgress, targetProgress)

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

@@ -68,8 +68,9 @@
     <string name="dictionary_management_title">Словари</string>
     <string name="import_dictionary_button">Выбрать файлы</string>
     <string name="import_error">Не удалось импортировать словарь: %1$s</string>
-    <string name="import_file_exists">Файл уже существует: %1$s</string>
+    <string name="import_file_exists">Словарь уже добавлен: %1$s</string>
     <string name="import_invalid_file_name">Недопустимое имя файла: %1$s</string>
+    <string name="import_nothing_imported">В выбранном нет поддерживаемых файлов словарей</string>
     <string name="dictionary_source_url_hint">URL</string>
     <string name="dictionary_source_add_button">Добавить источник</string>
     <string name="dictionary_source_duplicate">Этот URL уже существует</string>

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

@@ -66,8 +66,9 @@
     <string name="dictionary_management_title">Dictionaries</string>
     <string name="import_dictionary_button">Select files</string>
     <string name="import_error">Failed to import dictionary: %1$s</string>
-    <string name="import_file_exists">File already exists: %1$s</string>
+    <string name="import_file_exists">Dictionary already added: %1$s</string>
     <string name="import_invalid_file_name">Invalid file name: %1$s</string>
+    <string name="import_nothing_imported">No supported dictionary files were found in the selection</string>
     <string name="dictionary_source_url_hint">URL</string>
     <string name="dictionary_source_add_button">Add source</string>
     <string name="dictionary_source_duplicate">This URL already exists</string>

gradle/libs.versions.toml

@@ -1,5 +1,5 @@
 [versions]
-aboutlibraries = "15.0.4"
+aboutlibraries = "15.2.0"
 activity_compose = "1.13.0"
 agp = "9.3.1"
 compose_bom = "2026.08.00"