feat: improve social network presence handling and cleanup

- Add "(you)" indicator on tooltip when hovering current user's node
- Ensure current user always appears in graph even with no connections
- Add new participants immediately to graph (no 30s delay)
- Implement "leave" message protocol for presence cleanup:
  - Client sends leave message before disconnecting
  - Server broadcasts leave to other clients on disconnect
  - Clients remove presence records on receiving leave
- Generate consistent user colors from CryptID username (not session ID)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/automerge/CloudflareAdapter.ts

@@ -182,6 +182,7 @@ export class CloudflareNetworkAdapter extends NetworkAdapter {
   private isConnecting: boolean = false
   private onJsonSyncData?: (data: any) => void
   private onPresenceUpdate?: (userId: string, data: any, senderId?: string, userName?: string, userColor?: string) => void
+  private onPresenceLeave?: (sessionId: string) => void
 
   // Binary sync mode - when true, uses native Automerge sync protocol
   private useBinarySync: boolean = true
@@ -221,13 +222,15 @@ export class CloudflareNetworkAdapter extends NetworkAdapter {
     workerUrl: string,
     roomId?: string,
     onJsonSyncData?: (data: any) => void,
-    onPresenceUpdate?: (userId: string, data: any, senderId?: string, userName?: string, userColor?: string) => void
+    onPresenceUpdate?: (userId: string, data: any, senderId?: string, userName?: string, userColor?: string) => void,
+    onPresenceLeave?: (sessionId: string) => void
   ) {
     super()
     this.workerUrl = workerUrl
     this.roomId = roomId || 'default-room'
     this.onJsonSyncData = onJsonSyncData
     this.onPresenceUpdate = onPresenceUpdate
+    this.onPresenceLeave = onPresenceLeave
     this.readyPromise = new Promise((resolve) => {
       this.readyResolve = resolve
     })
@@ -435,6 +438,15 @@ export class CloudflareNetworkAdapter extends NetworkAdapter {
                 }
                 return
               }
+
+              // Handle leave messages (user disconnected)
+              if (message.type === 'leave') {
+                console.log('👋 CloudflareAdapter: User left:', message.sessionId)
+                if (this.onPresenceLeave && message.sessionId) {
+                  this.onPresenceLeave(message.sessionId)
+                }
+                return
+              }
               
               // Convert the message to the format expected by Automerge
               if (message.type === 'sync' && message.data) {
@@ -648,8 +660,20 @@ export class CloudflareNetworkAdapter extends NetworkAdapter {
   private cleanup(): void {
     this.stopKeepAlive()
     this.clearReconnectTimeout()
-    
+
     if (this.websocket) {
+      // Send leave message before closing to notify other clients
+      if (this.websocket.readyState === WebSocket.OPEN && this.sessionId) {
+        try {
+          this.websocket.send(JSON.stringify({
+            type: 'leave',
+            sessionId: this.sessionId
+          }))
+          console.log('👋 CloudflareAdapter: Sent leave message for session:', this.sessionId)
+        } catch (e) {
+          // Ignore errors when sending leave message
+        }
+      }
       this.websocket.close(1000, 'Client disconnecting')
       this.websocket = null
     }

src/components/networking/NetworkGraphMinimap.tsx

@@ -318,10 +318,11 @@ export function NetworkGraphMinimap({
       .style('cursor', 'pointer')
       .on('mouseenter', (event, d) => {
         const rect = svgRef.current!.getBoundingClientRect();
+        const name = d.displayName || d.username;
         setTooltip({
           x: event.clientX - rect.left,
           y: event.clientY - rect.top,
-          text: d.displayName || d.username,
+          text: d.isCurrentUser ? `${name} (you)` : name,
         });
       })
       .on('mouseleave', () => {

src/components/networking/useNetworkGraph.ts

@@ -242,6 +242,27 @@ export function useNetworkGraph(options: UseNetworkGraphOptions = {}): UseNetwor
         isAnonymous: false, // Nodes from the graph are authenticated
       }));
 
+      // Always ensure the current user is in the graph, even if they have no connections
+      const currentUserInGraph = enrichedNodes.some(n => n.isCurrentUser);
+      if (!currentUserInGraph) {
+        // Find current user in room participants
+        const currentUserParticipant = roomParticipants.find(p => p.id === session.username);
+        if (currentUserParticipant) {
+          enrichedNodes.push({
+            id: currentUserParticipant.id,
+            username: currentUserParticipant.username,
+            displayName: currentUserParticipant.username,
+            avatarColor: currentUserParticipant.color,
+            isInRoom: true,
+            roomPresenceColor: currentUserParticipant.color,
+            isCurrentUser: true,
+            isAnonymous: false,
+            trustLevelTo: undefined,
+            trustLevelFrom: undefined,
+          });
+        }
+      }
+
       // Add room participants who are not in the network graph as anonymous nodes
       roomParticipants.forEach(participant => {
         if (!graphNodeIds.has(participant.id) && participant.id !== session.username) {
@@ -297,17 +318,52 @@ export function useNetworkGraph(options: UseNetworkGraphOptions = {}): UseNetwor
     }
   }, [refreshInterval, fetchGraph]);
 
-  // Update room status when participants change
+  // Update room status when participants change AND add new participants immediately
   useEffect(() => {
-    setState(prev => ({
+    setState(prev => {
-      ...prev,
+      const existingNodeIds = new Set(prev.nodes.map(n => n.id));
-      nodes: prev.nodes.map(node => ({
+
+      // Update existing nodes with room status
+      const updatedNodes = prev.nodes.map(node => ({
         ...node,
         isInRoom: participantIds.includes(node.id),
         roomPresenceColor: participantColorMap.get(node.id),
-      })),
+      }));
-    }));
+
-  }, [participantIds, participantColorMap]);
+      // Add any new room participants that aren't in the graph yet
+      roomParticipants.forEach(participant => {
+        if (!existingNodeIds.has(participant.id)) {
+          // Check if this is the current user
+          const isCurrentUser = participant.id === session.username;
+
+          // Check if this looks like an anonymous/guest ID
+          const isAnonymous = !isCurrentUser && (
+            participant.username.startsWith('Guest') ||
+            participant.username === 'Anonymous' ||
+            !participant.id.match(/^[a-zA-Z0-9_-]+$/)
+          );
+
+          updatedNodes.push({
+            id: participant.id,
+            username: participant.username,
+            displayName: participant.username,
+            avatarColor: participant.color,
+            isInRoom: true,
+            roomPresenceColor: participant.color,
+            isCurrentUser,
+            isAnonymous,
+            trustLevelTo: undefined,
+            trustLevelFrom: undefined,
+          });
+        }
+      });
+
+      return {
+        ...prev,
+        nodes: updatedNodes,
+      };
+    });
+  }, [participantIds, participantColorMap, roomParticipants, session.username]);
 
   // Connect to a user
   const connect = useCallback(async (userId: string, trustLevel: TrustLevel = 'connected') => {

worker/AutomergeDurableObject.ts

@@ -427,6 +427,13 @@ export class AutomergeDurableObject {
       serverWebSocket.addEventListener("close", (event) => {
         console.log(`🔌 AutomergeDurableObject: Client disconnected: ${sessionId}, code: ${event.code}, reason: ${event.reason}`)
         this.clients.delete(sessionId)
+
+        // Broadcast leave message to all other clients so they can remove presence
+        this.broadcastToOthers(sessionId, {
+          type: 'leave',
+          sessionId: sessionId
+        })
+
         // Clean up sync manager state for this peer and flush pending saves
         if (this.syncManager) {
           this.syncManager.handlePeerDisconnect(sessionId).catch((error) => {
@@ -610,6 +617,15 @@ export class AutomergeDurableObject {
         }
         this.broadcastToOthers(sessionId, presenceMessage)
         break
+      case "leave":
+        // Handle explicit leave message (client is about to disconnect)
+        // Broadcast to all other clients so they can remove presence
+        console.log(`👋 Received leave message from ${sessionId}`)
+        this.broadcastToOthers(sessionId, {
+          type: 'leave',
+          sessionId: message.sessionId || sessionId
+        })
+        break
       default:
         console.log("Unknown message type:", message.type)
     }