Strict mode and tweak layout padding

src-web/components/Workspaces.tsx

@@ -1,4 +1,5 @@
 import { Button } from './core/Button';
+import { Editor } from './core/Editor';
 import { Heading } from './core/Heading';
 import { VStack } from './core/Stacks';
 import { useWorkspaces } from '../hooks/useWorkspaces';
@@ -13,6 +14,7 @@ export default function Workspaces() {
           {w.name}
         </Button>
       ))}
+      <Editor defaultValue="hello world" />
     </VStack>
   );
 }