fix(presence): broadcast presence_update to friends + DM members + space members

Six WS sites that previously broadcast presence_update to spaces only now use
collectProfileBroadcastTargetIds (the same recipient set as user_updated):
  - ws/handler.ts finalizeDisconnect (offline)
  - ws/handler.ts auth path (online)
  - ws/events.ts handlePresenceUpdate (manual idle/dnd/online)
  - ws/events.ts handleActivityUpdate (rich activity changes)
  - routes/users.ts showActivity-toggle clear
  - routes/users.ts status PATCH

Friends with no shared space + DM-only co-members now see each other's
online/offline transitions live, matching user_updated semantics. Federated
stub presence broadcasts (Task B3) use the same helper, so cross-instance
recipients are uniform.

Updates one assertion in social.federated.test.ts that asserted the old
snowflake-style stub username (now realname-based per A1).

packages/server/src/routes/users.ts

@@ -436,16 +436,14 @@ export async function userRoutes(app: FastifyInstance): Promise<void> {
       connectionManager.setUserShowActivity(request.userId, showActivity);
       if (!showActivity) {
         connectionManager.clearUserActivities(request.userId);
-        const userSpaces = connectionManager.getUserSpaces(request.userId);
         const clearPayload = {
           type: 'presence_update' as const,
           userId: request.userId,
           status: connectionManager.getUserStatus(request.userId),
           activities: [] as Activity[],
         };
-        for (const spaceId of userSpaces) {
-          connectionManager.sendToSpace(spaceId, clearPayload, request.userId);
-        }
+        const clearTargets = collectProfileBroadcastTargetIds(request.userId);
+        for (const uid of clearTargets) connectionManager.sendToUser(uid, clearPayload);
         connectionManager.sendToUser(request.userId, clearPayload);
 
         // S2S: project the cleared-activities snapshot to all active peers.
@@ -498,19 +496,14 @@ export async function userRoutes(app: FastifyInstance): Promise<void> {
 
     // Broadcast presence update if status changed
     if (status !== undefined) {
-      const userSpaces = connectionManager.getUserSpaces(sanitized.id);
-      for (const spaceId of userSpaces) {
-        connectionManager.sendToSpace(spaceId, {
-          type: 'presence_update',
-          userId: sanitized.id,
-          status: status,
-        }, sanitized.id);
-      }
-      connectionManager.sendToUser(sanitized.id, {
-        type: 'presence_update',
+      const statusPayload = {
+        type: 'presence_update' as const,
         userId: sanitized.id,
         status: status,
-      });
+      };
+      const statusTargets = collectProfileBroadcastTargetIds(sanitized.id);
+      for (const uid of statusTargets) connectionManager.sendToUser(uid, statusPayload);
+      connectionManager.sendToUser(sanitized.id, statusPayload);
     }
 
     // Broadcast user_updated for profile field changes