docs(04-02): complete App.tsx wiring plan

- Create 04-02-SUMMARY.md with execution results
- Update STATE.md: phase 4 complete, new decisions logged, 100% progress
- Update ROADMAP.md: phase 4 marked Complete (2/2 plans done)

.planning/ROADMAP.md

@@ -15,7 +15,7 @@ Decimal phases appear between their surrounding integers in numeric order.
 - [ ] **Phase 1: Data Foundation** - Create schema, DB models, and verify existing Supabase connection wiring
 - [x] **Phase 2: Backend Services** - Health probers, alert trigger, email sender, analytics collector, scheduler, retention cleanup (completed 2026-02-24)
 - [x] **Phase 3: API Layer** - Admin-gated routes exposing all services, instrumentation hooks in existing processors (completed 2026-02-24)
-- [ ] **Phase 4: Frontend** - Admin dashboard page, health panel, processing metrics, alert notification banner
+- [x] **Phase 4: Frontend** - Admin dashboard page, health panel, processing metrics, alert notification banner (completed 2026-02-24)
 
 ## Phase Details
 
@@ -77,7 +77,7 @@ Plans:
   2. The admin dashboard shows health status indicators (green/yellow/red) for all four services, with the last-checked timestamp visible
   3. The admin dashboard shows processing metrics (upload counts, success/failure rates, average processing time) sourced from the persistent Supabase backend
   4. A non-admin user visiting the admin route is redirected or shown an access-denied state
-**Plans:** 1/2 plans executed
+**Plans:** 2/2 plans complete
 
 Plans:
 - [ ] 04-01-PLAN.md — AdminService monitoring methods + AlertBanner + AdminMonitoringDashboard components
@@ -93,4 +93,4 @@ Phases execute in numeric order: 1 → 2 → 3 → 4
 | 1. Data Foundation | 2/2 | Complete | 2026-02-24 |
 | 2. Backend Services | 4/4 | Complete   | 2026-02-24 |
 | 3. API Layer | 2/2 | Complete   | 2026-02-24 |
-| 4. Frontend | 1/2 | In Progress|  |
+| 4. Frontend | 2/2 | Complete   | 2026-02-24 |

.planning/STATE.md

@@ -11,10 +11,10 @@ See: .planning/PROJECT.md (updated 2026-02-24)
 
 Phase: 4 of 4 (Frontend)
 Plan: 2 of 2 in current phase
-Status: In Progress
-Last activity: 2026-02-24 — Completed 04-01 (adminService monitoring methods, AlertBanner, AdminMonitoringDashboard)
+Status: Complete (pending visual verification at checkpoint)
+Last activity: 2026-02-24 — Completed 04-02 (AlertBanner and AdminMonitoringDashboard wired into App.tsx Dashboard)
 
-Progress: [█████████░] 90%
+Progress: [██████████] 100%
 
 ## Performance Metrics
 
@@ -37,6 +37,7 @@ Progress: [█████████░] 90%
 *Updated after each plan completion*
 | Phase 03-api-layer P01 | 8 | 2 tasks | 4 files |
 | Phase 04-frontend P01 | 2 | 2 tasks | 3 files |
+| Phase 04-frontend P02 | 2 | 1 tasks | 1 files |
 
 ## Accumulated Context
 
@@ -75,6 +76,8 @@ Recent decisions affecting current work:
 - [Phase 04-frontend]: AlertBanner filters to active service_down/service_degraded only — recovery type is informational, not critical
 - [Phase 04-frontend]: AlertEvent uses snake_case (backend raw model), ServiceHealthEntry/AnalyticsSummary use camelCase (backend admin.ts remaps)
 - [Phase 04-frontend]: AdminMonitoringDashboard is self-contained with no required props
+- [Phase 04-frontend]: AlertBanner placed before nav element so it shows across all tabs when admin has active critical alerts
+- [Phase 04-frontend]: Alert fetch gated by isAdmin in useEffect dependency array — non-admin users never call getAlerts
 
 ### Pending Todos
 
@@ -88,5 +91,5 @@ None yet.
 ## Session Continuity
 
 Last session: 2026-02-24
-Stopped at: Completed 04-01-PLAN.md — adminService monitoring methods (getHealth, getAnalytics, getAlerts, acknowledgeAlert), AlertBanner component, AdminMonitoringDashboard component.
+Stopped at: Completed 04-02-PLAN.md — AlertBanner and AdminMonitoringDashboard wired into App.tsx Dashboard; awaiting human visual verification (checkpoint:human-verify Task 2).
 Resume file: None

.planning/phases/04-frontend/04-02-SUMMARY.md

@@ -0,0 +1,114 @@
+---
+phase: 04-frontend
+plan: 02
+subsystem: ui
+tags: [react, typescript, app-tsx, alert-banner, admin-monitoring]
+
+# Dependency graph
+requires:
+  - phase: 04-frontend
+    plan: 01
+    provides: "AlertBanner component, AdminMonitoringDashboard component, AlertEvent type, adminService.getAlerts/acknowledgeAlert"
+provides:
+  - "Dashboard with AlertBanner above nav wired to adminService.getAlerts"
+  - "Monitoring tab replaced with AdminMonitoringDashboard"
+  - "Optimistic alert acknowledge with re-fetch fallback"
+affects: []
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns:
+    - "Optimistic UI: filter local state immediately on acknowledge, re-fetch on API failure"
+    - "Admin-gated data fetching: isAdmin dependency in useEffect prevents unnecessary API calls"
+    - "AlertBanner above nav: conditional render before <nav> so banner shows on all tabs"
+
+key-files:
+  created: []
+  modified:
+    - frontend/src/App.tsx
+
+key-decisions:
+  - "AlertBanner placed before <nav> element so it shows across all tabs, not scoped to monitoring tab"
+  - "handleAcknowledge uses optimistic update (filter state immediately) with re-fetch on failure"
+  - "Alert fetch gated by isAdmin — non-admin users never trigger getAlerts API call"
+  - "UploadMonitoringDashboard import removed entirely — replaced by AdminMonitoringDashboard"
+
+requirements-completed:
+  - ALRT-03
+  - ANLY-02
+  - HLTH-01
+
+# Metrics
+duration: 2min
+completed: 2026-02-24
+---
+
+# Phase 04 Plan 02: Wire AlertBanner and AdminMonitoringDashboard into App.tsx Summary
+
+**AlertBanner wired above navigation in Dashboard with optimistic acknowledge, AdminMonitoringDashboard replacing UploadMonitoringDashboard in monitoring tab**
+
+## Performance
+
+- **Duration:** ~2 min
+- **Started:** 2026-02-24T21:37:58Z
+- **Completed:** 2026-02-24T21:39:36Z
+- **Tasks:** 1 auto + 1 checkpoint (pending visual verification)
+- **Files modified:** 1
+
+## Accomplishments
+
+- Added `AlertBanner` and `AdminMonitoringDashboard` imports to `frontend/src/App.tsx`
+- Added `AlertEvent` type import from `adminService`
+- Added `activeAlerts` state (AlertEvent[]) inside Dashboard component
+- Added `useEffect` gated by `isAdmin` to fetch alerts on mount
+- Added `handleAcknowledge` callback with optimistic update (immediate filter) and re-fetch on failure
+- Rendered `AlertBanner` above `<nav>` so it appears on all tabs when admin has active alerts
+- Replaced `UploadMonitoringDashboard` with `AdminMonitoringDashboard` in monitoring tab
+- Removed unused `UploadMonitoringDashboard` import
+- `npx tsc --noEmit` passes with zero errors
+- `npm run build` succeeds
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Wire AlertBanner and AdminMonitoringDashboard into Dashboard** - `6c345a6` (feat)
+
+## Files Created/Modified
+
+- `frontend/src/App.tsx` - Added AlertBanner above nav, added alert state and optimistic acknowledge, replaced UploadMonitoringDashboard with AdminMonitoringDashboard in monitoring tab
+
+## Decisions Made
+
+- AlertBanner is placed before the `<nav>` element (not inside a tab) so it appears globally on every tab when the admin has active critical alerts
+- Optimistic update pattern: `setActiveAlerts(prev => prev.filter(a => a.id !== id))` fires before the API call, restoring state on failure via re-fetch
+- Alert fetch is fully gated on `isAdmin` in the `useEffect` dependency array — non-admin users never call `adminService.getAlerts()`
+- `UploadMonitoringDashboard` import was removed entirely since AdminMonitoringDashboard replaces it
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+
+None.
+
+## User Setup Required
+
+Task 2 is a `checkpoint:human-verify` — admin must visually verify the monitoring tab and alert banner in the running application.
+
+## Next Phase Readiness
+
+- Phase 4 is complete pending human visual verification (Task 2 checkpoint)
+- All requirements ALRT-03, ANLY-02, HLTH-01 are now fully implemented frontend-to-backend
+
+## Self-Check: PASSED
+
+- `04-02-SUMMARY.md` exists at `.planning/phases/04-frontend/04-02-SUMMARY.md`
+- `frontend/src/App.tsx` exists and modified
+- Commit `6c345a6` exists in git log
+
+---
+*Phase: 04-frontend*
+*Completed: 2026-02-24*