frontend: fix build failure

frontend/src/components/InvidiousSearchModal.tsx

@@ -108,7 +108,7 @@ const InvidiousSearchModal: React.FC<InvidiousSearchModalProps> = ({ isOpen, onC
             disabled={isLoading}
             className="bg-violet-500 text-white p-2 rounded-lg px-4 border-2 border-violet-500 disabled:opacity-50"
           >
-            {isLoading ? <FaSpinner className="animate-spin" /> : <FaSearch />}
+            {isLoading ? <span className="animate-spin"><FaSpinner /></span> : <span><FaSearch /></span>}
           </button>
         </div>