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>

resources/js/pages/Dashboard.vue

@@ -11,6 +11,7 @@ import {
     Users,
 } from 'lucide-vue-next';
 import { computed } from 'vue';
+import PriorityAlertsPanel from '@/components/dashboard/PriorityAlertsPanel.vue';
 import StatCard from '@/components/dashboard/StatCard.vue';
 import { Badge } from '@/components/ui/badge';
 import { Button } from '@/components/ui/button';
@@ -163,6 +164,12 @@ function navigateToDeclaration(declaration: DashboardDeclaration): void {
                     />
                 </div>
 
+                <!-- Priority Alerts Panel -->
+                <PriorityAlertsPanel
+                    :alerts="alerts"
+                    :view-all-url="viewAllAlertsUrl"
+                />
+
                 <!-- Urgent Declarations Table -->
                 <div class="space-y-4">
                     <div class="flex items-center justify-between">