fix(test): mock WallOfLove and DiscordButton in page tests (JhaSourav07#2233)

## Description
Fixes JhaSourav07#2231 

Resolves JSDOM timeouts in `app/page.test.tsx` by mocking/stubbing
`WallOfLove` and `DiscordButton` within the LandingPage tests. This
isolates the component under test from infinite GSAP loop cycles and
ScrollTrigger event listeners that freeze JSDOM.

## Pillar
- [x] 🛠️ Other (Bug fix, refactoring, docs)

## Checklist before requesting a review:
- [x] I have read the `CONTRIBUTING.md` file.
- [x] I have tested these changes locally
(`localhost:3000/api/streak?user=...`).
- [x] I have run `npm run format` and `npm run lint` locally and
resolved all errors.
- [x] I have run `npm run test` and all tests pass locally.
- [x] I have run `npm run test:coverage` and branch coverage is at or
above 70%.
- [x] My commits follow the Conventional Commits format.
- [x] I have made sure that I have only one commit to merge in this PR.

Author: JhaSourav07

app/page.test.tsx

@@ -14,6 +14,14 @@ vi.mock('@/components/commitpulse-logo', () => ({
   CommitPulseLogo: () => <svg data-testid="commitpulse-logo"></svg>,
 }));
 
+vi.mock('@/components/WallOfLove', () => ({
+  WallOfLove: () => <div data-testid="wall-of-love">Wall of Love</div>,
+}));
+
+vi.mock('@/components/DiscordButton', () => ({
+  DiscordButton: () => <button data-testid="discord-button">Discord Button</button>,
+}));
+
 // next/image is no longer used — SVG preview is fetched via useEffect and
 // rendered inline. The mock below keeps the import from erroring if any
 // other test file still imports it.