feat: unified station mode with POS + repairs desk view

Phase 1: Station shell
- /station route replaces /pos (with redirect)
- Shared lock screen, activity tracking, auto-lock timer
- Permission-gated tab bar (POS | Repairs | Lessons)
- POSRegister embedded mode (skip lock/timer/topbar)
- Sidebar navigates to /station

Phase 2: Repairs station — front desk
- Status bar with count badges per status group, clickable filters
- Ticket queue panel with search and status filtering
- Ticket detail panel with status progress, notes, photos, line items
- Full stepped intake form: customer → item → problem/estimate → review
- Service template quick-add for line items

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/admin/src/routes/pos.tsx

@@ -1,14 +1,7 @@
-import { createFileRoute } from '@tanstack/react-router'
-import { POSRegister } from '@/components/pos/pos-register'
+import { createFileRoute, redirect } from '@tanstack/react-router'
 
 export const Route = createFileRoute('/pos')({
-  component: POSPage,
+  beforeLoad: () => {
+    throw redirect({ to: '/station' })
+  },
 })
-
-function POSPage() {
-  return (
-    <div className="h-screen w-screen overflow-hidden bg-background text-foreground">
-      <POSRegister />
-    </div>
-  )
-}