Redesign POS order flow with order type picker and counter/takeaway support

- Add OrderTypePicker screen: Table / Counter / Takeaway cards shown when no
  active session, replacing the old always-visible table board
- Move PosTableBoard into a modal overlay (opens on Table selection or
  "Assign Table" for counter orders)
- Add orderType field + setOrderType action to cart store
- Counter and Takeaway orders no longer require a table to submit
- Add "Assign Table →" button in cart for counter orders with active session
- Rewrite category tabs as horizontal scrollable row (no wrapping)
- Larger product cards with 4:3 thumbnail + quantity badge overlay
- Bigger quantity controls (h-8 w-8) and "New order" back button in header
- Add i18n keys for order types in en/fa/ar

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/dashboard/messages/en.json

@@ -231,7 +231,18 @@
     "customerSaveError": "Could not save customer",
     "customerPhoneExists": "Phone already registered — search and select",
     "newCustomerHint": "Use for this order only, or tap Add customer to save to CRM",
-    "offlineQueueNotice": "Offline — order saved in queue and will sync when connected"
+    "offlineQueueNotice": "Offline — order saved in queue and will sync when connected",
+    "orderTypePicker": "How would you like to take this order?",
+    "orderTypeTable": "Table",
+    "orderTypeTableDesc": "Seat guest at a specific table",
+    "orderTypeCounter": "Counter",
+    "orderTypeCounterDesc": "Walk-in, no table yet",
+    "orderTypeTakeaway": "Takeaway",
+    "orderTypeTakeawayDesc": "Order to go",
+    "counterBadge": "Counter",
+    "takeawayBadge": "Takeaway",
+    "assignTable": "Assign table",
+    "newOrder": "New order"
   },
   "print": {
     "printReceipt": "Print receipt",