fix(workspace): English slash commands, short texts, wider menu

/image replaces /bild (aliases bild/foto keep working), shorter
descriptions for /link, /image, /audio, /diktat; the menu is wider, the
command never wraps and long descriptions are cut off.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

frontend/src/features/workspace/ImagePicker.tsx

@@ -8,7 +8,7 @@ interface ImagePickerProps {
   onCancel: () => void;
 }
 
-// Inline box an empty bullet turns into after /bild: pick a file (or the camera on phones), drop or
+// Inline box an empty bullet turns into after /image: pick a file (or the camera on phones), drop or
 // paste an image, or give a link the server copies. Nothing is synced until the upload succeeded.
 export const ImagePicker: React.FC<ImagePickerProps> = ({ docId, onDone, onCancel }) => {
   const [busy, setBusy] = useState(false);