feat: implement search, sorting, and accordion UX improvements

[yashuroy08]

🎯 Objective

Implement client-side search, sorting, and user experience (UX) enhancements in the Good First Issue application.

### 🛠️ Changes Implemented
1. **Reusable Control Panel Component**:
   - Created `components/ControlPanel.vue` featuring a responsive search input and sorting selector (Stars: High/Low, Issues: Most first, Activity:

Recent first).
2. Search and Sorting Logic:
- Integrated ControlPanel.vue and implemented client-side filtering on repo name/description in pages/index.vue and pages/language/[slug]. vue.
- Added a friendly "No projects found" state when results are empty.
3. Runtime Crash Prevention (Safe Tag Fallback):
- Fixed a potential runtime 500 error in pages/language/[slug].vue. If a language slug is not found in tags.json (due to repository
thresholds), it now capitalization-falls-back to the slug name and avoids crashing.
4. Accordion UX Event Propagation Fix:
- Refactored components/RepoBox.vue so the accordion click listener is strictly on the header container.
- Added @click.stop to the repository link so that opening the project on GitHub does not collapse the card.

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*Disclosure: This contribution was co-authored and verified with the help of Antigravity AI coding assistant.*

[vercel]

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