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/users/Create.vue

@@ -4,7 +4,6 @@ import Heading from '@/components/Heading.vue';
 import UserForm from '@/components/UserForm.vue';
 import type { UserFormData } from '@/components/UserForm.vue';
 import AppLayout from '@/layouts/AppLayout.vue';
-import type { BreadcrumbItem } from '@/types';
 
 type Props = {
     indexUrl: string;