loop/webui: add prettier
diff --git a/loop/webui/src/web-components/demo/sketch-view-mode-select.demo.html b/loop/webui/src/web-components/demo/sketch-view-mode-select.demo.html
index dac6831..0d71067 100644
--- a/loop/webui/src/web-components/demo/sketch-view-mode-select.demo.html
+++ b/loop/webui/src/web-components/demo/sketch-view-mode-select.demo.html
@@ -3,29 +3,32 @@
     <title>sketch-view-mode-select demo</title>
     <link rel="stylesheet" href="demo.css" />
 
-    <script src="/dist/web-components/sketch-view-mode-select.js" type="module"></script>
+    <script
+      src="/dist/web-components/sketch-view-mode-select.js"
+      type="module"
+    ></script>
 
     <script>
       document.addEventListener("DOMContentLoaded", () => {
-        const viewModeSelect = document.querySelector('sketch-view-mode-select');
+        const viewModeSelect = document.querySelector(
+          "sketch-view-mode-select",
+        );
         const msgDiv = document.querySelector("#selected-mode");
         msgDiv.innerText = `selected mode: ${viewModeSelect.activeMode}`;
 
         console.log("viewModeSelect: ", viewModeSelect);
         viewModeSelect.addEventListener("view-mode-select", (evt) => {
-          console.log('view mode change event: ', evt);
+          console.log("view mode change event: ", evt);
           const msgDiv = document.querySelector("#selected-mode");
           msgDiv.innerText = `selected mode: ${evt.detail.mode}`;
         });
       });
-  </script>
-
+    </script>
   </head>
   <body>
     <h1>sketch-view-mode-select demo</h1>
 
     <sketch-view-mode-select></sketch-view-mode-select>
     <div id="selected-mode"></div>
-
   </body>
-</html>
\ No newline at end of file
+</html>