docs(06-02): complete web chat portal UI plan

- Add 06-02-SUMMARY.md with full execution record
- Update STATE.md: progress 96%, decisions recorded, session updated
- Update ROADMAP.md: phase 6 plan progress (2/3 summaries)

.planning/STATE.md

@@ -3,14 +3,14 @@ gsd_state_version: 1.0
 milestone: v1.0
 milestone_name: milestone
 status: completed
-stopped_at: Completed 06-01-PLAN.md
-last_updated: "2026-03-25T16:28:34.002Z"
+stopped_at: Completed 06-02-PLAN.md
+last_updated: "2026-03-25T16:36:09.493Z"
 last_activity: 2026-03-23 — Completed 03-02 onboarding wizard, Slack OAuth, BYO API keys
 progress:
   total_phases: 6
   completed_phases: 5
   total_plans: 25
-  completed_plans: 23
+  completed_plans: 24
   percent: 100
 ---
 
@@ -75,6 +75,7 @@ Progress: [██████████] 100%
 | Phase 05-employee-design P03 | 2min | 1 tasks | 0 files |
 | Phase 05-employee-design P04 | 1min | 2 tasks | 3 files |
 | Phase 06-web-chat P01 | 8min | 2 tasks | 11 files |
+| Phase 06-web-chat PP02 | 6min | 2 tasks | 10 files |
 
 ## Accumulated Context
 
@@ -163,6 +164,8 @@ Recent decisions affecting current work:
 - [Phase 06-web-chat]: WebSocket auth via first JSON message after connection — browser WebSocket API cannot send custom HTTP headers
 - [Phase 06-web-chat]: thread_id = conversation_id in web channel normalizer — scopes agent memory to one web conversation per conversation ID
 - [Phase 06-web-chat]: Redis pub-sub delivery: orchestrator publishes to webchat_response_key, WebSocket subscribes with 60s timeout before sending to client
+- [Phase 06-web-chat]: useSearchParams wrapped in Suspense boundary — Next.js 16 static prerendering requires Suspense for pages using URL params
+- [Phase 06-web-chat]: Stable callback refs in useChatSocket — onMessage/onTyping held in refs so WebSocket effect re-runs only when conversationId or auth changes
 
 ### Roadmap Evolution
 
@@ -178,6 +181,6 @@ None — all phases complete.
 
 ## Session Continuity
 
-Last session: 2026-03-25T16:28:33.999Z
-Stopped at: Completed 06-01-PLAN.md
+Last session: 2026-03-25T16:36:09.490Z
+Stopped at: Completed 06-02-PLAN.md
 Resume file: None