feat(ui): add SettingsScreen and SettingsViewModel

app/src/main/java/com/radiola/ui/settings/SettingsViewModel.kt

@@ -0,0 +1,48 @@
+package com.radiola.ui.settings
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import com.radiola.domain.model.DeeplinkService
+import com.radiola.domain.repository.SettingsRepository
+import dagger.hilt.android.lifecycle.HiltViewModel
+import kotlinx.coroutines.flow.*
+import kotlinx.coroutines.launch
+import javax.inject.Inject
+
+@HiltViewModel
+class SettingsViewModel @Inject constructor(
+    private val settingsRepository: SettingsRepository
+) : ViewModel() {
+
+    val sleepTimerMinutes: StateFlow<Int> = settingsRepository.getSleepTimerMinutes()
+        .stateIn(viewModelScope, SharingStarted.WhileSubscribed(5000), 30)
+
+    val enabledServices: StateFlow<Set<String>> = settingsRepository.getEnabledDeeplinkServices()
+        .stateIn(viewModelScope, SharingStarted.WhileSubscribed(5000), emptySet())
+
+    val equalizerPreset: StateFlow<String> = settingsRepository.getEqualizerPreset()
+        .stateIn(viewModelScope, SharingStarted.WhileSubscribed(5000), "Flat")
+
+    val isRecordingEnabled: StateFlow<Boolean> = settingsRepository.isRecordingEnabled()
+        .stateIn(viewModelScope, SharingStarted.WhileSubscribed(5000), false)
+
+    fun setSleepTimer(minutes: Int) {
+        viewModelScope.launch { settingsRepository.setSleepTimerMinutes(minutes) }
+    }
+
+    fun toggleService(serviceId: String, enabled: Boolean) {
+        viewModelScope.launch {
+            val current = enabledServices.value.toMutableSet()
+            if (enabled) current.add(serviceId) else current.remove(serviceId)
+            settingsRepository.setEnabledDeeplinkServices(current)
+        }
+    }
+
+    fun setEqualizerPreset(preset: String) {
+        viewModelScope.launch { settingsRepository.setEqualizerPreset(preset) }
+    }
+
+    fun setRecordingEnabled(enabled: Boolean) {
+        viewModelScope.launch { settingsRepository.setRecordingEnabled(enabled) }
+    }
+}