docs(22-01): complete add-to-collection flow plan

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.planning/STATE.md

@@ -3,14 +3,14 @@ gsd_state_version: 1.0
 milestone: v1.3
 milestone_name: Research & Decision Tools
 status: planning
-stopped_at: Phase 22 plans verified
-last_updated: "2026-04-06T13:47:00.873Z"
+stopped_at: Completed 22-01-PLAN.md
+last_updated: "2026-04-06T13:57:51.148Z"
 last_activity: 2026-04-06
 progress:
   total_phases: 16
   completed_phases: 14
   total_plans: 43
-  completed_plans: 39
+  completed_plans: 40
   percent: 0
 ---
 
@@ -61,6 +61,7 @@ Key decisions made during v2.0 planning:
 - [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
+- [Phase 22]: Sonner for toast notifications; all Phase 22 UIStore states added in Plan 01
 
 ### Pending Todos
 
@@ -72,6 +73,7 @@ None active.
 |---|-------------|------|--------|-----------|
 | 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 |
+| Phase 22 P01 | 7min | 2 tasks | 5 files |
 
 ### Blockers/Concerns
 
@@ -80,6 +82,6 @@ None active.
 
 ## Session Continuity
 
-Last session: 2026-04-06T13:47:00.871Z
-Stopped at: Phase 22 plans verified
-Resume file: .planning/phases/22-add-from-catalog-thread-integration/22-01-PLAN.md
+Last session: 2026-04-06T13:57:51.145Z
+Stopped at: Completed 22-01-PLAN.md
+Resume file: None