clan-app: Finish flash view. clan-cli: Flash cli now verifies if language and keymap are valid.

pkgs/webview-ui/app/src/index.tsx

@@ -13,7 +13,7 @@ window.clan = window.clan || {};
 
 if (import.meta.env.DEV && !(root instanceof HTMLElement)) {
   throw new Error(
-    "Root element not found. Did you forget to add it to your index.html? Or maybe the id attribute got misspelled?"
+    "Root element not found. Did you forget to add it to your index.html? Or maybe the id attribute got misspelled?",
   );
 }
 
@@ -30,5 +30,5 @@ render(
     </QueryClientProvider>
   ),
   // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
-  root!
+  root!,
 );