fix: add missing frontend dependencies and remove trailing whitespace

- Add @tanstack/react-query, axios, and clsx to frontend dependencies
- Remove trailing whitespace from multiple files to pass pre-commit hooks
- These were required but missing from package.json

frontend/src/pages/ImportCaddy.tsx

@@ -79,7 +79,7 @@ export default function ImportCaddy() {
               The system will detect conflicts and allow you to review changes before committing.
             </p>
           </div>
-          
+
           <div className="space-y-4">
             {/* File Upload */}
             <div>