#feature/search n add multiple books

[codebude]

• Added basket functionality
• Highlight the selected edition in import search
• Document import basket and selected edition highlight in release notes

Note: This implements #87

[github-actions]

🧪 Test Results — 13db30d

✅ Backend (pytest) — 1030 passed, 0 failed, 0 skipped (1030 total)
✅ CLI (pytest) — 54 passed, 0 failed, 0 skipped (54 total)
✅ Frontend (vitest) — 534 passed, 0 failed, 0 skipped (534 total)
✅ E2E (Playwright) — 79 passed, 0 failed, 0 skipped (79 total)

Summary: ✅ All 1697 tests passed