docs(21-03): complete card navigation rewire and panel removal plan

- SUMMARY.md with 2 tasks, 10 files modified, 3 deviations documented
- STATE.md updated with position, decisions, metrics
- Requirements DETAIL-04, DETAIL-05 marked complete

.planning/STATE.md

@@ -3,14 +3,14 @@ gsd_state_version: 1.0
 milestone: v1.3
 milestone_name: Research & Decision Tools
 status: planning
-stopped_at: Completed 20-02-PLAN.md
-last_updated: "2026-04-06T06:17:39.050Z"
+stopped_at: Completed 21-03-PLAN.md
+last_updated: "2026-04-06T13:14:25.653Z"
 last_activity: 2026-04-06
 progress:
-  total_phases: 14
+  total_phases: 15
   completed_phases: 13
   total_plans: 38
-  completed_plans: 36
+  completed_plans: 37
   percent: 0
 ---
 
@@ -58,6 +58,9 @@ Key decisions made during v2.0 planning:
 - [Phase 20]: Created tags table in schema (was missing, needed for GET /api/tags endpoint)
 - [Phase 20]: FAB visible on all authenticated routes, not just collection gear tab
 - [Phase 20]: Add button on catalog search cards is a stub (Phase 21 wires actual flow)
+- [Phase 21]: Preserved currentThreadId derivation in __root.tsx for CandidateDeleteDialog
+- [Phase 21]: CollectionView empty state Add button rewired to catalog search overlay
+- [Phase 21]: ItemForm/CandidateForm decoupled from UIStore with onClose prop pattern
 
 ### Pending Todos
 
@@ -68,6 +71,7 @@ None active.
 | # | Description | Date | Commit | Directory |
 |---|-------------|------|--------|-----------|
 | 260406-j44 | Comprehensive dev seed script for bikepacking gear data | 2026-04-06 | — | [260406-j44-comprehensive-dev-seed-script-for-bikepa](./quick/260406-j44-comprehensive-dev-seed-script-for-bikepa/) |
+| Phase 21 P03 | 6min | 2 tasks | 10 files |
 
 ### Blockers/Concerns
 
@@ -76,6 +80,6 @@ None active.
 
 ## Session Continuity
 
-Last session: 2026-04-06T06:12:00.000Z
-Stopped at: Completed 20-02-PLAN.md
+Last session: 2026-04-06T13:14:25.651Z
+Stopped at: Completed 21-03-PLAN.md
 Resume file: None