Migrate auth hooks to AuthContext and update tests for compatibility

- Refactored `useIsAuthenticated` and `useCurrentUser` to use `useAuth` from `AuthContext` instead of `useAuthStore`.
- Updated test setups to inject `AuthProvider` with mocked store hooks for improved test isolation and consistency.
- Replaced legacy `useAuthStore` mocks with `AuthContext`-compatible implementations in affected tests.

frontend/src/lib/api/hooks/useAuth.ts

@@ -22,6 +22,7 @@ import {
 } from '../client';
 import { useAuthStore } from '@/lib/stores/authStore';
 import type { User } from '@/lib/stores/authStore';
+import { useAuth } from '@/lib/auth/AuthContext';
 import { parseAPIError, getGeneralError } from '../errors';
 import { isTokenWithUser } from '../types';
 import config from '@/config/app.config';
@@ -481,7 +482,7 @@ export function usePasswordChange(onSuccess?: (message: string) => void) {
  * @returns boolean indicating authentication status
  */
 export function useIsAuthenticated(): boolean {
-  return useAuthStore((state) => state.isAuthenticated);
+  return useAuth((state) => state.isAuthenticated);
 }
 
 /**
@@ -489,7 +490,7 @@ export function useIsAuthenticated(): boolean {
  * @returns Current user or null
  */
 export function useCurrentUser(): User | null {
-  return useAuthStore((state) => state.user);
+  return useAuth((state) => state.user);
 }
 
 /**