feat(cli): Add /model command for interactive model selection (#8940)

Co-authored-by: Miguel Solorio <miguel.solorio07@gmail.com>

packages/cli/src/ui/hooks/useModelCommand.ts

@@ -0,0 +1,31 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { useState, useCallback } from 'react';
+
+interface UseModelCommandReturn {
+  isModelDialogOpen: boolean;
+  openModelDialog: () => void;
+  closeModelDialog: () => void;
+}
+
+export const useModelCommand = (): UseModelCommandReturn => {
+  const [isModelDialogOpen, setIsModelDialogOpen] = useState(false);
+
+  const openModelDialog = useCallback(() => {
+    setIsModelDialogOpen(true);
+  }, []);
+
+  const closeModelDialog = useCallback(() => {
+    setIsModelDialogOpen(false);
+  }, []);
+
+  return {
+    isModelDialogOpen,
+    openModelDialog,
+    closeModelDialog,
+  };
+};