Feature: Add real-time repository search functionality

[meet1785]

🔍 Feature: Real-Time Repository Search

Description

Adds a search functionality that allows users to filter repositories in real-time by name, owner, language, or description.

Motivation

Users currently have to scroll through all repositories to find what they're looking for. This search feature improves discoverability and user experience, especially as the repository list grows.

Changes Made

• ✅ Added search input in Navbar with responsive design
• ✅ Implemented case-insensitive filtering logic
• ✅ Added visual feedback (results count & empty states)
• ✅ Works on both home page and language-specific pages
• ✅ Auto-resets search when navigating between pages
• ✅ Includes comprehensive unit tests (8 test cases)

Testing

npm install --legacy-peer-deps
npm run test:unit  # All tests pass ✅
npm run dev        # Test manually at http://localhost:3000

[SuryaGanesh284]

I am working on this!!