feat: Phase 4 - customer posts feed, create, detail, respond
- Add create/close post mutations with auth & ownership verification
- Add getOrCreate chat mutation for handyman response flow
- PostCard component: title, description preview, category badge,
location, budget, status badge (open=green, closed=red)
- Post detail screen: full description, category, location, budget,
status, time-ago. Owner: close button. Handyman: respond button
creates/opens chat with customer
- Create post screen: title, description, category picker, location,
budget, auth-gated with redirect
- Posts feed: open/all filter tabs, new-post button for customers
All UI text in Macedonian. TypeScript clean, Convex functions deployed.
echo
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