fix: Clear file list when selected models do not support file uploads

src/lib/components/chat/MessageInput/InputMenu.svelte

@@ -55,6 +55,10 @@
 	$: fileUploadEnabled =
 		fileUploadCapableModels.length === selectedModels.length &&
 		($user?.role === 'admin' || $user?.permissions?.chat?.file_upload);
+	
+	$: if (!fileUploadEnabled && files.length > 0) {
+		files = [];
+	}
 
 	const detectMobile = () => {
 		const userAgent = navigator.userAgent || navigator.vendor || window.opera;