feat: Add DarkModeManager for managing dark mode p

src/utils/DarkModeManager.ts

@@ -0,0 +1,27 @@
+class DarkModeManager {
+  private darkModeKey: string;
+
+  constructor() {
+    this.darkModeKey = 'darkMode';
+  }
+
+  enableDarkMode(): void {
+    localStorage.setItem(this.darkModeKey, 'true');
+  }
+
+  disableDarkMode(): void {
+    localStorage.setItem(this.darkModeKey, 'false');
+  }
+
+  toggleDarkMode(): void {
+    const isCurrentlyEnabled = this.isDarkModeEnabled();
+    localStorage.setItem(this.darkModeKey, isCurrentlyEnabled ? 'false' : 'true');
+  }
+
+  isDarkModeEnabled(): boolean {
+    const storedValue = localStorage.getItem(this.darkModeKey);
+    return storedValue === 'true';
+  }
+}
+
+export { DarkModeManager };