FRE-600: Fix code review blockers

- Consolidated duplicate UndoManagers to single instance
- Fixed connection promise to only resolve on 'connected' status
- Fixed WebSocketProvider import (WebsocketProvider)
- Added proper doc.destroy() cleanup
- Renamed isPresenceInitialized property to avoid conflict

Co-Authored-By: Paperclip <noreply@paperclip.ing>

server/websocket/index.ts

@@ -23,12 +23,12 @@ export async function startServer(config: ServerConfig) {
       return { userId: 'anonymous', projectId: 'default' };
     }
 
-    // Simple JWT verification (in production, use jsonwebtoken library)
     try {
-      const decoded = JSON.parse(Buffer.from(token.split('.')[1], 'base64').toString());
+      const jwt = require('jsonwebtoken');
+      const decoded = jwt.verify(token, jwtSecret);
       return {
-        userId: decoded.userId,
-        projectId: decoded.projectId,
+        userId: (decoded as any).userId,
+        projectId: (decoded as any).projectId,
       };
     } catch (error) {
       throw new Error('Invalid JWT token');

server/websocket/server.ts

@@ -4,8 +4,7 @@
  */
 
 import { WebSocketServer } from 'ws';
-import { applyUpdate, encodeStateAsUpdate } from 'yjs';
-import { decode } from 'yjs/lib/index.js';
+import { applyUpdate, encodeStateAsUpdate, Doc } from 'yjs';
 
 type DocMessage = {
   type: 'sync';
@@ -105,14 +104,10 @@ export function createWebSocketServer(
 }
 
 /**
- * Encode sync step 1 (send document state)
+ * Encode sync step 1 (send document state as binary)
  */
 function encodeSyncStep1(state: Uint8Array): Uint8Array {
-  const updateMsg = {
-    type: 'sync',
-    args: [state],
-  };
-  return new TextEncoder().encode(JSON.stringify(updateMsg));
+  return state;
 }
 
 /**
@@ -174,7 +169,7 @@ function handleUpdate(ws: WebSocketWithDoc, docName: string, message: UpdateMess
   
   // Apply update to document state
   try {
-    const doc = decode(currentState);
+    const doc = new Doc();
     applyUpdate(doc, update);
     currentState = encodeStateAsUpdate(doc);
     docs.set(docName, currentState);
@@ -182,14 +177,14 @@ function handleUpdate(ws: WebSocketWithDoc, docName: string, message: UpdateMess
     console.log(`Update applied to ${docName}. Size: ${currentState.length} bytes`);
     
     // Broadcast update to all other clients
-    const broadcastMsg = JSON.stringify({
+    const broadcastMsg = {
       type: 'update',
       args: [Array.from(update)],
-    });
+    };
     
     clients.get(docName)?.forEach(client => {
       if (client !== ws && client.readyState === WebSocket.OPEN) {
-        client.send(new TextEncoder().encode(broadcastMsg));
+        client.send(new TextEncoder().encode(JSON.stringify(broadcastMsg)));
       }
     });
   } catch (error) {