INFRA: Set Up Project.

lib/controllers/theme_controller.dart

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+import 'package:flutter/material.dart';
+import 'package:get/get.dart';
+import '../utils/preferences.dart';
+
+class ThemeController extends GetxController {
+  RxBool isDark = false.obs;
+
+  @override
+  void onInit() {
+    super.onInit();
+    loadTheme();
+  }
+
+  void loadTheme() {
+    // Use safe getBoolean from Preferences
+    isDark.value = Preferences.getBoolean(Preferences.themKey);
+  }
+
+  void toggleTheme() {
+    isDark.value = !isDark.value;
+    Preferences.setBoolean(Preferences.themKey, isDark.value);
+  }
+
+  ThemeMode get themeMode => isDark.value ? ThemeMode.dark : ThemeMode.light;
+}
+
+