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/package-lock.json

@@ -2677,9 +2677,9 @@
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-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.5.3.tgz",
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+      "version": "8.5.6",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.5.6.tgz",
+      "integrity": "sha512-3Ybi1tAuwAP9s0r1UQ2J4n5Y0G05bJkpUIO0/bI9MhwmD70S5aTWbXGBwxHrelT+XM1k6dM0pk+SwNkpTRN7Pg==",
       "dev": true,
       "funding": [
         {
@@ -2697,7 +2697,7 @@
       ],
       "license": "MIT",
       "dependencies": {
-        "nanoid": "^3.3.8",
+        "nanoid": "^3.3.11",
         "picocolors": "^1.1.1",
         "source-map-js": "^1.2.1"
       },