feat: shadcn/ui + sidebar-07 + dashboard-01 layout

- shadcn init (neutral base, css variables)
- AppSidebar wired to panel routes (Overview/Projects/Operations/Events/Audit/Settings)
- NavUser dropdown uses Better Auth signOut
- SectionCards reads live counts from panel DB
- TooltipProvider wraps root layout

apps/web/next-env.d.ts

@@ -0,0 +1,6 @@
+/// <reference types="next" />
+/// <reference types="next/image-types/global" />
+import "./.next/types/routes.d.ts";
+
+// NOTE: This file should not be edited
+// see https://nextjs.org/docs/app/api-reference/config/typescript for more information.