docs(phase-4): evolve PROJECT.md after phase completion

.planning/PROJECT.md

@@ -40,13 +40,16 @@ desktop for read-only awareness.
   worker/backup status row, no charts. Backed by single `/api/mobile/dashboard`
   endpoint returning `kpis`/`needsAttention`/`workers`. Validated in Phase 3:
   Dashboard Restyle (DASH-01..04)
+- ✓ Tickets restyle — collapsible URL-synced filter strip, priority-stripe rows,
+  cursor-based infinite scroll (~25/page) via IntersectionObserver, Load more
+  fallback, detail page header reskinned. Backed by `/api/mobile/tickets` with
+  cursor pagination + exported `MobileTicket` / `MobileTicketListResponse` types.
+  Validated in Phase 4: Tickets Restyle (TICK-01..07)
 
 ### Active
 
 <!-- Hypotheses for this milestone — see docs/superpowers/specs/2026-05-03-mobile-shell-design.md -->
 
-- [ ] Tickets restyle — collapsible filter strip (URL-synced), priority-bar
-      rows, cursor-based infinite scroll (~25/page), keep detail page
 - [ ] Finance restyle — adopt new Card + typography scale, swap wide tables for
       stacked lists on mobile
 - [ ] Analyzer feed (NEW) — `/mobile/analyzer` read-only stream of recent AI
@@ -137,4 +140,4 @@ This document evolves at phase transitions and milestone boundaries.
 4. Update Context with current state
 
 ---
-*Last updated: 2026-05-03 — Phase 3 complete (Dashboard Restyle)*
+*Last updated: 2026-05-03 — Phase 4 complete (Tickets Restyle)*