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-ux-design/ux-design-template.md

@@ -0,0 +1,13 @@
+---
+stepsCompleted: []
+inputDocuments: []
+---
+
+# UX Design Specification {{project_name}}
+
+**Author:** {{user_name}}
+**Date:** {{date}}
+
+---
+
+<!-- UX design content will be appended sequentially through collaborative workflow steps -->