feat(ui): add themed shell navigation

lib/util/sharedPrefs.dart

@@ -1,3 +1,5 @@
+// ignore_for_file: file_names
+
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
@@ -21,43 +23,61 @@ class SharedPrefNotifier<T> extends StateNotifier<T> {
 
   // Helper to get the value with proper typing
   static T _getValue<T>(SharedPreferences prefs, String key, T defaultValue) {
-    switch (T) {
-      case String:
-        return prefs.getString(key) as T ?? defaultValue;
-      case bool:
-        return prefs.getBool(key) as T ?? defaultValue;
-      case int:
-        return prefs.getInt(key) as T ?? defaultValue;
-      case double:
-        return prefs.getDouble(key) as T ?? defaultValue;
-      case const (List<String>):
-        return prefs.getStringList(key) as T ?? defaultValue;
-      default:
-        throw UnsupportedError('Type $T not supported by SharedPreferences');
+    if (T == String) {
+      return prefs.getString(key) as T? ?? defaultValue;
     }
+
+    if (T == bool) {
+      return prefs.getBool(key) as T? ?? defaultValue;
+    }
+
+    if (T == int) {
+      return prefs.getInt(key) as T? ?? defaultValue;
+    }
+
+    if (T == double) {
+      return prefs.getDouble(key) as T? ?? defaultValue;
+    }
+
+    if (T == List<String>) {
+      return prefs.getStringList(key) as T? ?? defaultValue;
+    }
+
+    throw UnsupportedError('Type $T not supported by SharedPreferences');
   }
 
   Future<void> update(T value) async {
-    switch (T) {
-      case String:
-        await prefs.setString(key, value as String);
-        break;
-      case bool:
-        await prefs.setBool(key, value as bool);
-        break;
-      case int:
-        await prefs.setInt(key, value as int);
-        break;
-      case double:
-        await prefs.setDouble(key, value as double);
-        break;
-      case const (List<String>):
-        await prefs.setStringList(key, value as List<String>);
-        break;
-      default:
-        throw UnsupportedError('Type $T not supported by SharedPreferences');
+    if (T == String) {
+      await prefs.setString(key, value as String);
+      state = value;
+      return;
     }
-    state = value;
+
+    if (T == bool) {
+      await prefs.setBool(key, value as bool);
+      state = value;
+      return;
+    }
+
+    if (T == int) {
+      await prefs.setInt(key, value as int);
+      state = value;
+      return;
+    }
+
+    if (T == double) {
+      await prefs.setDouble(key, value as double);
+      state = value;
+      return;
+    }
+
+    if (T == List<String>) {
+      await prefs.setStringList(key, value as List<String>);
+      state = value;
+      return;
+    }
+
+    throw UnsupportedError('Type $T not supported by SharedPreferences');
   }
 }
 
@@ -70,3 +90,37 @@ final isDarkModeProvider =
     defaultValue: false,
   );
 });
+
+enum AppThemePreference {
+  system,
+  light,
+  dark,
+}
+
+class ThemePreferenceNotifier extends StateNotifier<AppThemePreference> {
+  ThemePreferenceNotifier(this._prefs)
+      : super(_themePreferenceFromStorage(_prefs.getString(_themeModeKey)));
+
+  static const String _themeModeKey = 'app_theme_preference';
+
+  final SharedPreferences _prefs;
+
+  Future<void> update(AppThemePreference value) async {
+    await _prefs.setString(_themeModeKey, value.name);
+    state = value;
+  }
+}
+
+AppThemePreference _themePreferenceFromStorage(String? value) {
+  return switch (value) {
+    'light' => AppThemePreference.light,
+    'dark' => AppThemePreference.dark,
+    _ => AppThemePreference.system,
+  };
+}
+
+final appThemePreferenceProvider =
+    StateNotifierProvider<ThemePreferenceNotifier, AppThemePreference>((ref) {
+  final prefs = ref.watch(sharedPreferencesProvider);
+  return ThemePreferenceNotifier(prefs);
+});