fix: connect owner to WebSocket room — isCollaborator guard was blocking owner

templates/document_edit.html

···
     let wsMissedPings = 0;
 
     function connectWebSocket() {
-        if (!isCollaborator || !accessToken) return;
+        if (!accessToken) return;
 
         const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
         const ownerParam = ownerDID ? `&owner_did=${encodeURIComponent(ownerDID)}` : '';
···
     }
 
     async function loadComments() {
-        if (!isCollaborator) return;
+        if (!accessToken) return;
         try {
             const resp = await fetch(`/api/docs/${rkey}/comments`);
             if (!resp.ok) return;
···
 
     applyMode(currentMode);
 
-    // Start collaboration features
-    if (isCollaborator) {
+    // Start collaboration features (both owner and collaborators join the WS room)
+    if (accessToken) {
         connectWebSocket();
         loadComments();
     }