Add animated profile avatars

[klopez4212]

Summary

• add animated avatar capture, review, framing, background, and poster-frame tools
• save animated avatars as poster-first URLs with hover playback and loading feedback
• add camera permissions, APNG/MediaPipe support, haptics, and focused coverage

Validation

• ./bin/pnpm --dir desktop check
• ./bin/pnpm --dir desktop typecheck
• ./bin/pnpm --dir desktop test
• ./bin/pnpm --dir desktop exec playwright test animated-avatar-screenshots.spec.ts --project=smoke
• ./bin/pnpm --dir desktop exec playwright test profile.spec.ts --project=integration