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>

.claude/skills/bmad-create-prd/templates/prd-template.md

@@ -0,0 +1,10 @@
+---
+stepsCompleted: []
+inputDocuments: []
+workflowType: 'prd'
+---
+
+# Product Requirements Document - {{project_name}}
+
+**Author:** {{user_name}}
+**Date:** {{date}}