fix(settings): write the no-dictionaries seed only after a completed scan

A racing SettingsViewModel whose scan short-circuits with an in-progress
error persisted hadNoDictionaries from a still-empty list, forcing the
Settings screen on the next cold start despite existing dictionaries.

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

@@ -277,9 +277,10 @@ class SettingsViewModel(
     }
 
     private fun initialize() {
+        var scanCompleted = false
         viewModelScope.launch {
             try {
-                scanDirectoryInternal(preferencesManager.dictionaryPath)
+                scanCompleted = scanDirectoryInternal(preferencesManager.dictionaryPath) is OperationResult.Success
             } catch (e: Exception) {
                 android.util.Log.e("SettingsViewModel", "Initial scan failed", e)
                 dictionaryStatus.value = if (localDictionaryRepository.dictionaries.value.isEmpty()) {
@@ -296,12 +297,14 @@ class SettingsViewModel(
                     android.util.Log.w("SettingsViewModel", "Failed to load language preference: ${e.message}")
                 }
                 hasCompletedStartupScan.value = true
+                if (scanCompleted) {
                     preferencesManager.setHadNoDictionaries(
                         localDictionaryRepository.dictionaries.value.isEmpty()
                     )
                 }
             }
         }
+    }
 
     fun onEvent(event: SettingsUiEvent) {
         when (event) {