feature/public profile pages

[codebude]

• First shot of url sharing
• Add copy and open actions for share links
• Add backend database to .gitignore
• Add validation and scrolling to share link dialog
• Add language selection to public profile share links
• Add show more button to public profile timeline
• Add search to public profile library
• Add time range selection to public profile trends, fix and improve design
• Improve public profile design with avatars, timeline cards and distribution charts
• Document public profile sharing

[github-actions]

🧪 Test Results — 21c5639

✅ Backend (pytest) — 1030 passed, 0 failed, 0 skipped (1030 total)
✅ CLI (pytest) — 54 passed, 0 failed, 0 skipped (54 total)
✅ Frontend (vitest) — 518 passed, 0 failed, 0 skipped (518 total)
✅ E2E (Playwright) — 79 passed, 0 failed, 0 skipped (79 total)

Summary: ✅ All 1681 tests passed