feat: Update login navigation and authentication flow

- Changed navigation from '/editor' to '/tests' after successful login.
- Introduced token state management in AuthContext for better handling of authentication.
- Updated login function to store JWT instead of Google token.
- Added error handling for login and test fetching processes.

style: Enhance UI with new footer and test list styles

- Added a footer component with copyright information.
- Created a new TestList component with improved styling and animations.
- Implemented responsive design for test cards and filter tabs.
- Added loading and error states for better user experience.

fix: Improve API interaction for test fetching and password verification

- Refactored API calls to use a centralized studentApi utility.
- Enhanced error handling for API responses, including unauthorized access.
- Implemented password verification for protected tests before starting them.

Frontend/src/index.css

@@ -1225,6 +1225,8 @@ body {
   padding: 8px 12px;
   background-color: #252526;
   border-bottom: 1px solid rgba(128, 128, 128, 0.35);
+  position: relative;
+  z-index: 200;
 }
 
 .editor-controls {
@@ -1259,6 +1261,8 @@ body {
 .editor-actions {
   display: flex;
   gap: 8px;
+  position: relative;
+  z-index: 150;
 }
 
 .run-btn {
@@ -1672,4 +1676,19 @@ body {
 /* Make sure the footer appears on top of other elements */
 footer {
   z-index: 1000;
-}
+}
+
+/* Test List Animations */
+@keyframes fadeIn {
+  from { opacity: 0; }
+  to { opacity: 1; }
+}
+
+@keyframes slideUp {
+  from { transform: translateY(20px); opacity: 0; }
+  to { transform: translateY(0); opacity: 1; }
+}
+
+.animate-fadeIn { animation: fadeIn 0.3s ease-out; }
+.animate-slideUp { animation: slideUp 0.3s ease-out; }
+.line-clamp-2 { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }