feat: implement Story 2.2 — Priority Alerts Panel with UI fixes

Add PriorityAlertsPanel component to the dashboard, update DashboardController
with alert logic, and apply misc UI fixes across sidebar, forms, and pages.
Includes epic-1 retrospective and sprint status update.

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

_bmad-output/implementation-artifacts/sprint-status.yaml

@@ -34,6 +34,7 @@
 # - Dev moves story to 'review', then runs code-review (fresh context, different LLM recommended)
 
 generated: 2026-03-11
+last_updated: 2026-03-20T12:00:00
 project: "l'ami fiduciaire"
 project_key: NOKEY
 tracking_system: file-system
@@ -62,7 +63,7 @@ development_status:
   # Epic 2: Role-Driven Dashboard & Command Center
   epic-2: in-progress
   2-1-owner-manager-command-center-dashboard: review
-  2-2-priority-alerts-panel: backlog
+  2-2-priority-alerts-panel: review
   2-3-worker-scoped-dashboard: backlog
   2-4-dashboard-activity-feed: backlog
   epic-2-retrospective: optional