Feature: Settings persistence with DataStore

[Leostrange]

Settings are lost on every app restart

Currently ProcessingConfig is created fresh each time. Users lose all preferences (mode, quality, format, bitrate, noise reduction, stereo width) after closing the app.

Tasks

1. Add Jetpack DataStore dependency

In app/build.gradle.kts:

implementation("androidx.datastore:datastore-preferences:1.1.1")

2. Create SettingsRepository

File: app/src/main/java/com/example/vocalremover/data/SettingsRepository.kt

• fun getConfig(): Flow<ProcessingConfig>
• suspend fun saveConfig(config: ProcessingConfig)

3. Wire into DI

In DataModule.kt: provide SettingsRepository as @Singleton

4. Update MainViewModel

• Load saved config on init
• On settings change → save config automatically

5. Update SettingsSection.kt

• On any setting change callback → viewModel.updateConfig(...)

Acceptance Criteria

• Selected mode/quality/format survive app restart
• Bitrate and noise reduction settings are persisted
• Default config is used on first launch
• No ANR on DataStore read (use coroutines)