feat(dashboard): Next.js 16 merchant panel with offline POS and PWA

Complete merchant dashboard upgrade:

Next.js 16 compatibility:
- Fix params/searchParams typed as Promise<{}> throughout App Router
- Replace middleware.ts with proxy.ts (Next.js 16 convention)
- Remove unused @ts-expect-error directives caught by stricter TS
- Cast dynamic next-intl t() keys to fix TranslateArgs type errors

Offline POS:
- IndexedDB queue (meezi_pos_offline) for orders created while offline
- Zustand sync store tracking queueCount, isSyncing, isOnline
- useOfflineSync hook: auto-syncs on reconnect/visibility-change
- SyncStatusIndicator chip in topbar (amber=offline, blue=syncing)
- submitOrderToApi falls back to local order on network failure
- Local orders skip payment flow; sync on reconnect

PWA (installable):
- @ducanh2912/next-pwa with Workbox runtime caching rules
- Web App Manifest (manifest.ts) — RTL/Farsi, theme #0F6E56
- PWA icons: 192px, 512px, maskable 512px
- next.config.ts replaces next.config.mjs

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

web/dashboard/package.json

@@ -0,0 +1,50 @@
+{
+  "name": "meezi-dashboard",
+  "version": "0.1.0",
+  "private": true,
+  "scripts": {
+    "dev": "next dev",
+    "build": "next build",
+    "start": "next start",
+    "lint": "next lint",
+    "typecheck": "tsc --noEmit -p tsconfig.typecheck.json",
+    "test:e2e": "playwright test",
+    "test:e2e:ui": "playwright test --ui"
+  },
+  "dependencies": {
+    "@google/model-viewer": "^4.2.0",
+    "three": "^0.163.0",
+    "@microsoft/signalr": "^8.0.7",
+    "@radix-ui/react-alert-dialog": "^1.1.15",
+    "@radix-ui/react-dropdown-menu": "^2.1.2",
+    "@radix-ui/react-label": "^2.1.0",
+    "@radix-ui/react-slot": "^1.1.0",
+    "@tanstack/react-query": "^5.59.20",
+    "axios": "^1.7.7",
+    "class-variance-authority": "^0.7.0",
+    "clsx": "^2.1.1",
+    "date-fns-jalali": "^4.1.0-0",
+    "lucide-react": "^0.454.0",
+    "next": "16.2.6",
+    "next-intl": "4.12.0",
+    "@ducanh2912/next-pwa": "^10.2.9",
+    "react": "19.2.6",
+    "react-dom": "19.2.6",
+    "recharts": "^2.13.3",
+    "sonner": "^2.0.7",
+    "tailwind-merge": "^2.5.4",
+    "zustand": "^5.0.1"
+  },
+  "devDependencies": {
+    "@playwright/test": "^1.49.0",
+    "@types/node": "^22.9.0",
+    "@types/react": "19.1.4",
+    "@types/react-dom": "19.1.4",
+    "autoprefixer": "^10.4.20",
+    "eslint": "^8.57.1",
+    "eslint-config-next": "16.2.6",
+    "postcss": "^8.4.47",
+    "tailwindcss": "^3.4.14",
+    "typescript": "^5.6.3"
+  }
+}