new-bucket dialog: Enter in name field submits

Typing a name and hitting Enter did nothing — users had to move to
the Create button. Wire Enter on the name input to click the submit
path so the common flow is keyboard-only.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

public/plugins/collab-buckets/collab-buckets.js

@@ -392,6 +392,18 @@ async function createBucketDialog() {
             }
         });
 
+        // Enter in the name field = Create (users expect the submit path
+        // without reaching for the mouse). Stop propagation so nothing
+        // upstream grabs it. No-op if name is empty — the submit button's
+        // own handler validates.
+        overlay.querySelector('#__cb_name').addEventListener('keydown', (e) => {
+            if (e.key === 'Enter') {
+                e.preventDefault();
+                e.stopPropagation();
+                overlay.querySelector('.collab-btn-submit').click();
+            }
+        });
+
         setTimeout(() => overlay.querySelector('#__cb_name')?.focus(), 50);
     });
 }