init

lib/app/theme/theme_mode_controller.dart

@@ -0,0 +1,21 @@
+import 'package:flutter/material.dart';
+import 'package:riverpod_annotation/riverpod_annotation.dart';
+
+part 'theme_mode_controller.g.dart';
+
+@riverpod
+class ThemeModeController extends _$ThemeModeController {
+  @override
+  ThemeMode build() => ThemeMode.system;
+
+  void setThemeMode(ThemeMode mode) {
+    state = mode;
+  }
+
+  void toggle() {
+    state = switch (state) {
+      ThemeMode.dark => ThemeMode.light,
+      ThemeMode.light || ThemeMode.system => ThemeMode.dark,
+    };
+  }
+}