fix(settings): evaluate update availability on operations and startup

Re-evaluate after indexing completes, persist the last status with its check date, and restore it on startup. When the saved date is older than today the status is re-evaluated once, so new dictionary updates stay visible without a server request on every launch.

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

@@ -33,6 +33,7 @@ class PreferencesManager(private val context: Context) {
         val IS_DICTIONARIES_EXPANDED = booleanPreferencesKey("is_dictionaries_expanded")
         val DISABLED_DICTIONARY_PATHS = stringSetPreferencesKey("disabled_dictionary_paths")
         val HAD_NO_DICTIONARIES = booleanPreferencesKey("had_no_dictionaries")
+        val DICTIONARY_STATUS = stringPreferencesKey("dictionary_status")
     }
 
     private val json = Json { ignoreUnknownKeys = true }
@@ -86,6 +87,15 @@ class PreferencesManager(private val context: Context) {
         }
     }
 
+    suspend fun dictionaryStatus(): String? =
+        context.dataStore.data.first()[PreferencesKeys.DICTIONARY_STATUS]
+
+    suspend fun saveDictionaryStatus(status: String) {
+        context.dataStore.edit { preferences ->
+            preferences[PreferencesKeys.DICTIONARY_STATUS] = status
+        }
+    }
+
     suspend fun sectionExpansionStates(): SectionExpansionStates =
         context.dataStore.data.first().let { preferences ->
             SectionExpansionStates(

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

@@ -7,6 +7,7 @@ import androidx.lifecycle.viewModelScope
 import com.example.research.DictionaryStatus
 import com.example.research.R
 import com.example.research.common.progress.DictionaryProgressStateHolder
+import com.example.research.common.util.DateUtils
 import com.example.research.core.domain.model.AppTheme
 import com.example.research.core.domain.model.Dictionary
 import com.example.research.core.domain.model.DictionarySource
@@ -100,9 +101,26 @@ class SettingsViewModel(
     init {
         setupStateObservation()
         observeDictionariesForSeedFlag()
+        persistDictionaryStatus()
         initialize()
     }
 
+    private fun persistDictionaryStatus() {
+        viewModelScope.launch {
+            dictionaryStatus.collect { status ->
+                val persistedName = when (status) {
+                    DictionaryStatus.UpToDate -> "UpToDate"
+                    DictionaryStatus.NeedsUpdate -> "NeedsUpdate"
+                    DictionaryStatus.Empty -> "Empty"
+                    else -> null
+                }
+                if (persistedName != null) {
+                    preferencesManager.saveDictionaryStatus("$persistedName|${DateUtils.getCurrentDateString()}")
+                }
+            }
+        }
+    }
+
     private fun observeDictionariesForSeedFlag() {
         viewModelScope.launch {
             localDictionaryRepository.dictionaries.collect { dictionaries ->
@@ -161,7 +179,9 @@ class SettingsViewModel(
                 if (wasIndexing && !isIndexing) {
                     if (isDownloadInProgress) {
                         isDownloadInProgress = false
-                        dictionaryStatus.value = DictionaryStatus.UpToDate
+                        dictionaryStatus.value = withContext(Dispatchers.IO) {
+                            evaluateDictionaryStatus()
+                        }
                     }
                 }
                 wasIndexing = isIndexing
@@ -561,9 +581,21 @@ class SettingsViewModel(
                     dictionaryStatus.value = DictionaryStatus.UpToDate
                     isDownloadInProgress = false
                 } else {
-                    dictionaryStatus.value = DictionaryStatus.Checking
+                    val savedStatus = preferencesManager.dictionaryStatus()
-                    val status = withContext(Dispatchers.IO) { evaluateDictionaryStatus() }
+                    val savedStatusName = savedStatus?.substringBefore('|')
-                    dictionaryStatus.value = status
+                    val savedStatusDate = savedStatus?.substringAfter('|', "")
+                    val restoredStatus = when (savedStatusName) {
+                        "UpToDate" -> DictionaryStatus.UpToDate
+                        "NeedsUpdate" -> DictionaryStatus.NeedsUpdate
+                        else -> null
+                    }
+                    if (restoredStatus != null && savedStatusDate == DateUtils.getCurrentDateString()) {
+                        dictionaryStatus.value = restoredStatus
+                    } else {
+                        dictionaryStatus.value = DictionaryStatus.Checking
+                        val status = withContext(Dispatchers.IO) { evaluateDictionaryStatus() }
+                        dictionaryStatus.value = status
+                    }
                 }
 
                 if (result.data > 0) {