docs(02-03): complete visual verification plan for planning threads

- All four THRD requirements verified working end-to-end in browser
- Phase 2 complete, STATE.md and ROADMAP.md updated

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

.planning/STATE.md

@@ -2,16 +2,16 @@
 gsd_state_version: 1.0
 milestone: v1.0
 milestone_name: milestone
-status: executing
-stopped_at: Completed 02-02-PLAN.md
-last_updated: "2026-03-15T10:46:26Z"
-last_activity: 2026-03-15 — Completed 02-02 thread frontend UI
+status: completed
+stopped_at: Completed 02-03-PLAN.md
+last_updated: "2026-03-15T10:51:17.267Z"
+last_activity: 2026-03-15 — Completed 02-03 visual verification
 progress:
   total_phases: 3
-  completed_phases: 1
+  completed_phases: 2
   total_plans: 7
-  completed_plans: 6
-  percent: 71
+  completed_plans: 7
+  percent: 100
 ---
 
 # Project State
@@ -26,11 +26,11 @@ See: .planning/PROJECT.md (updated 2026-03-14)
 ## Current Position
 
 Phase: 2 of 3 (Planning Threads)
-Plan: 2 of 3 in current phase
-Status: In progress
-Last activity: 2026-03-15 — Completed 02-02 thread frontend UI
+Plan: 3 of 3 in current phase (COMPLETE)
+Status: Phase complete
+Last activity: 2026-03-15 — Completed 02-03 visual verification
 
-Progress: [█████████░] 86%
+Progress: [██████████] 100%
 
 ## Performance Metrics
 
@@ -55,6 +55,7 @@ Progress: [█████████░] 86%
 | Phase 01 P04 | 3min | 2 tasks | 5 files |
 | Phase 02 P01 | 5min | 2 tasks | 9 files |
 | Phase 02 P02 | 4min | 2 tasks | 10 files |
+| Phase 02 P03 | 1min | 1 tasks | 0 files |
 
 ## Accumulated Context
 
@@ -79,6 +80,7 @@ Recent decisions affecting current work:
 - [Phase 02-02]: Tab navigation uses URL search params (?tab=gear|planning) for shareable URLs
 - [Phase 02-02]: Candidate panel runs as separate SlideOutPanel instance with independent uiStore state
 - [Phase 02-02]: Resolution invalidates threads, items, and totals queries for cross-tab data freshness
+- [Phase 02-03]: All four THRD requirements verified working end-to-end in browser
 
 ### Pending Todos
 
@@ -91,6 +93,6 @@ None yet.
 
 ## Session Continuity
 
-Last session: 2026-03-15T10:46:26Z
-Stopped at: Completed 02-02-PLAN.md
-Resume file: .planning/phases/02-planning-threads/02-02-SUMMARY.md
+Last session: 2026-03-15T10:51:17.265Z
+Stopped at: Completed 02-03-PLAN.md
+Resume file: None