feat: Add user metadata changing display name and description with sync

toju-app/src/app/infrastructure/realtime/README.md

@@ -232,7 +232,7 @@ A single ordered data channel carries all peer-to-peer messages: chat events, at
 
 Back-pressure is handled with a high-water mark (4 MB) and low-water mark (1 MB). `sendToPeerBuffered()` waits for the buffer to drain before sending, which matters during file transfers.
 
-Profile avatar sync follows attachment-style chunk transport plus server-icon-style version handshakes: sender announces `avatarUpdatedAt`, receiver requests only when remote version is newer, then sender streams ordered base64 chunks over buffered sends.
+Profile avatar sync follows attachment-style chunk transport plus server-icon-style version handshakes: sender announces avatar/profile versions, receiver requests only when either remote version is newer, then sender streams ordered base64 chunks when avatar bytes are needed and still uses the same full-event path for profile-only updates.
 
 Every 5 seconds a PING message is sent to each peer. The peer responds with PONG carrying the original timestamp, and the round-trip latency is stored in a signal.
 

toju-app/src/app/infrastructure/realtime/realtime-session.service.ts

@@ -328,8 +328,13 @@ export class WebRTCService implements OnDestroy {
    * @param oderId      - The user's unique order/peer ID.
    * @param displayName - The user's display name.
    */
-  identify(oderId: string, displayName: string, signalUrl?: string): void {
-    this.signalingTransportHandler.identify(oderId, displayName, signalUrl);
+  identify(
+    oderId: string,
+    displayName: string,
+    signalUrl?: string,
+    profile?: { description?: string; profileUpdatedAt?: number }
+  ): void {
+    this.signalingTransportHandler.identify(oderId, displayName, signalUrl, profile);
   }
 
   /**

toju-app/src/app/infrastructure/realtime/realtime.types.ts

@@ -36,6 +36,10 @@ export interface IdentifyCredentials {
   oderId: string;
   /** The user's display name shown to other peers. */
   displayName: string;
+  /** Optional profile description advertised via signaling identity. */
+  description?: string;
+  /** Monotonic profile version for late-join reconciliation. */
+  profileUpdatedAt?: number;
 }
 
 /** Last-joined server info, used for reconnection. */

toju-app/src/app/infrastructure/realtime/signaling/signaling-transport-handler.ts

@@ -30,6 +30,10 @@ export class SignalingTransportHandler<TMessage> {
     return this.lastIdentifyCredentials?.displayName || DEFAULT_DISPLAY_NAME;
   }
 
+  getIdentifyDescription(): string | undefined {
+    return this.lastIdentifyCredentials?.description;
+  }
+
   getConnectedSignalingManagers(): ConnectedSignalingManager[] {
     return this.dependencies.signalingCoordinator.getConnectedSignalingManagers();
   }
@@ -160,12 +164,27 @@ export class SignalingTransportHandler<TMessage> {
     return true;
   }
 
-  identify(oderId: string, displayName: string, signalUrl?: string): void {
+  identify(
+    oderId: string,
+    displayName: string,
+    signalUrl?: string,
+    profile?: Pick<IdentifyCredentials, 'description' | 'profileUpdatedAt'>
+  ): void {
     const normalizedDisplayName = displayName.trim() || DEFAULT_DISPLAY_NAME;
+    const normalizedDescription = typeof profile?.description === 'string'
+      ? (profile.description.trim() || undefined)
+      : undefined;
+    const normalizedProfileUpdatedAt = typeof profile?.profileUpdatedAt === 'number'
+      && Number.isFinite(profile.profileUpdatedAt)
+      && profile.profileUpdatedAt > 0
+      ? profile.profileUpdatedAt
+      : undefined;
 
     this.lastIdentifyCredentials = {
       oderId,
-      displayName: normalizedDisplayName
+      displayName: normalizedDisplayName,
+      description: normalizedDescription,
+      profileUpdatedAt: normalizedProfileUpdatedAt
     };
 
     if (signalUrl) {
@@ -173,6 +192,8 @@ export class SignalingTransportHandler<TMessage> {
         type: SIGNALING_TYPE_IDENTIFY,
         oderId,
         displayName: normalizedDisplayName,
+        description: normalizedDescription,
+        profileUpdatedAt: normalizedProfileUpdatedAt,
         connectionScope: signalUrl
       });
 
@@ -190,6 +211,8 @@ export class SignalingTransportHandler<TMessage> {
         type: SIGNALING_TYPE_IDENTIFY,
         oderId,
         displayName: normalizedDisplayName,
+        description: normalizedDescription,
+        profileUpdatedAt: normalizedProfileUpdatedAt,
         connectionScope: managerSignalUrl
       });
     }