feat(03-02): Paw reactions GREEN — toggle/count router + PawButton on PostCard
- reactions.toggle: assertPetOwnership → findUnique(postId_petId) → create or delete, return {reacted}
- reactions.hasReacted, getCount implemented
- feed.ts + posts.byPetId: add _count{reactions,comments} to hydration include
- PawButton: optimistic toggle, filled/outline PawPrint icon, count badge
- PostCard: replace "0 likes/0 comments" placeholder with action row (PawButton + comment chip + Paw-Back stub)
- PostCardPost type: add optional _count field
- 4/4 reactions tests GREEN; 56 passing total (+3 from 53)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
adminandClaude Sonnet 4.6
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