JS refactors (#22227)

- Replace all default exports with named exports, except for Vue SFCs
- Remove names from Vue SFCs, they are automatically inferred from the
filename
- Misc whitespace-related tweaks

web_src/js/features/copycontent.js

@@ -1,6 +1,7 @@
 import {copyToClipboard} from './clipboard.js';
 import {showTemporaryTooltip} from '../modules/tippy.js';
 import {convertImage} from '../utils.js';
+
 const {i18n} = window.config;
 
 async function doCopy(content, btn) {