docs(state): record phase 17 context session

.planning/STATE.md

@@ -5,16 +5,16 @@ milestone_name: Operability & Polish
 current_phase: 999.1
 current_phase_name: BACKLOG
 status: executing
-stopped_at: Phase 19 UI-SPEC approved
-last_updated: "2026-06-18T00:00:14.867Z"
+stopped_at: Phase 17 context gathered
+last_updated: "2026-06-18T00:37:02.287Z"
 last_activity: 2026-06-18
 last_activity_desc: Phase 19 complete, transitioned to Phase 999.1
 progress:
-  total_phases: 24
+  total_phases: 26
   completed_phases: 11
   total_plans: 49
   completed_plans: 48
-  percent: 46
+  percent: 42
 ---
 
 # Project State
@@ -272,9 +272,9 @@ Recent decisions affecting current work:
 
 ## Session Continuity
 
-Last session: 2026-06-17T01:20:23.179Z
-Stopped at: Phase 19 UI-SPEC approved
-Resume file: .planning/phases/19-local-auth-no-oidc-mode/19-UI-SPEC.md
+Last session: 2026-06-18T00:37:02.272Z
+Stopped at: Phase 17 context gathered
+Resume file: .planning/phases/17-ui-optimization-polish/17-CONTEXT.md
 
 ## Operator Next Steps