docs: week 8 search functionality [feature complete]

Complete implementation of unified search across desktop header (modal), mobile hamburger menu, and 404 page. Features:
- Lazy-loaded /search-index.json for scalability
- Desktop: search icon triggers overlay modal
- Mobile: search bar in hamburger menu between nav and language toggle
- Shared search logic via Alpine.js components
- Full i18n support (EN/IT)
- WCAG 2.1 AA compliant (keyboard nav, focus management, screen reader support)
- Real-time filtering, max 5 results displayed

Tasks completed: 11 total
- Task 1: Generate search index JSON
- Task 2: Create shared search module
- Task 3: Create desktop search modal
- Task 4: Add search icon to header
- Task 5: Wire search event listener
- Task 6: Integrate search into mobile menu
- Task 7: Include modal and script in base template
- Task 8: Add i18n keys
- Task 9: Refactor 404 page to use shared search
- Task 10: Build and test
- Task 11: Branch and merge

Build verified: 289 EN pages + 253 IT pages, clean build.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

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