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

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

README.md

@@ -89,7 +89,7 @@ The main search screen remains usable as long as at least one indexed dictionary
 - Jetpack Compose (BOM 2026.09.00)
 - Material 3 1.5.0-beta01
 - Coroutines and Flow 1.11.0
-- DataStore Preferences 1.2.1
+- DataStore Preferences 1.3.0
 - Paging 3.5.3
 - OkHttp 5.5.0
 - kotlinx.serialization 1.12.0

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,

gradle/libs.versions.toml

@@ -4,7 +4,7 @@ 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 = "2.4.21"
 lifecycle_runtime_ktx = "2.11.0"