docs(21-02): complete candidate detail page and thread modal plan

- Add 21-02-SUMMARY.md with execution results
- Update STATE.md, ROADMAP.md, REQUIREMENTS.md

.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 21-02-PLAN.md
+last_updated: "2026-04-06T13:03:13.009Z"
 last_activity: 2026-04-06
 progress:
-  total_phases: 14
-  completed_phases: 13
-  total_plans: 38
-  completed_plans: 36
+  total_phases: 15
+  completed_phases: 14
+  total_plans: 39
+  completed_plans: 37
   percent: 0
 ---
 
@@ -58,6 +58,8 @@ 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]: Candidate data fetched from useThread hook (find in array) not new API endpoint
+- [Phase 21]: AddCandidateModal inline in thread page, local modal pattern replacing UIStore panel
 
 ### Pending Todos
 
@@ -68,6 +70,7 @@ 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 P02 | 4min | 2 tasks | 2 files |
 
 ### Blockers/Concerns
 
@@ -76,6 +79,6 @@ None active.
 
 ## Session Continuity
 
-Last session: 2026-04-06T06:12:00.000Z
-Stopped at: Completed 20-02-PLAN.md
+Last session: 2026-04-06T13:03:13.007Z
+Stopped at: Completed 21-02-PLAN.md
 Resume file: None