chore: Perform codebase cleanup and refactor App state management

frontend/src/components/theme-provider.tsx

@@ -15,9 +15,11 @@ const ThemeContext = createContext<ThemeContextType | undefined>(undefined)
 export function ThemeProvider({
   children,
   initialTheme = "light",
+  isAuthenticated = false,
 }: {
   children: React.ReactNode
   initialTheme?: Theme
+  isAuthenticated?: boolean
 }) {
   const [theme, setThemeState] = useState<Theme>(initialTheme)
 
@@ -29,10 +31,12 @@ export function ThemeProvider({
 
   const setTheme = async (newTheme: Theme) => {
     setThemeState(newTheme)
-    try {
-      await AuthService.updateTheme(newTheme)
-    } catch (error) {
-      console.error("Failed to sync theme to backend:", error)
+    if (isAuthenticated) {
+      try {
+        await AuthService.updateTheme(newTheme)
+      } catch (error) {
+        console.error("Failed to sync theme to backend:", error)
+      }
     }
   }