feat(collection-pool): wire bulk-assign dialog mount

src/app/(app)/collection-pool/page.tsx

@@ -352,6 +352,15 @@ export default function CollectionPoolPage() {
     [assignDialog, closeAssignDialog, updateItemStatus],
   );
 
+  const [bulkBusy, setBulkBusy] = useState(false);
+
+  const handleBulkAssignSubmit = useCallback(
+    async (_payload: AssignDriverSubmitPayload) => {
+      // Full implementation in Task 9.
+    },
+    [],
+  );
+
   const handleToggleReady = useCallback(
     async (row: CollectionPoolVisibleRow, ready: boolean) => {
       // Unmarking is a single PATCH with no note. The modal only opens
@@ -589,6 +598,25 @@ export default function CollectionPoolPage() {
           ) : undefined
         }
       />
+      <AssignDriverDialog
+        open={bulkAssignDialog !== null}
+        onOpenChange={(open) => {
+          if (!open) closeBulkAssign();
+        }}
+        onSubmit={handleBulkAssignSubmit}
+        bulkCount={bulkAssignDialog?.rowIds.length ?? 1}
+        eyebrow={
+          bulkAssignDialog ? (
+            <span className="inline-flex items-center gap-2">
+              <Truck className="size-3.5 text-muted-foreground" />
+              {bulkAssignDialog.supplierName || "Unknown supplier"}
+              <span className="text-muted-foreground">·</span>
+              {bulkAssignDialog.rowIds.length} stops
+            </span>
+          ) : undefined
+        }
+        busy={bulkBusy}
+      />
       {readyDialogRow && (
         <MarkReadyDialog
           open