fix: Prefer cached channels before loaded

toju-app/src/app/domains/server-directory/feature/invite/invite.component.ts

@@ -139,7 +139,12 @@ export class InviteComponent implements OnInit {
       RoomsActions.joinRoom({
         roomId: joinResponse.server.id,
         serverInfo: {
+          ...invite.server,
           ...joinResponse.server,
+          channels:
+            Array.isArray(joinResponse.server.channels) && joinResponse.server.channels.length > 0
+              ? joinResponse.server.channels
+              : invite.server.channels,
           sourceId: context.endpoint.id,
           sourceName: context.endpoint.name,
           sourceUrl: context.sourceUrl

toju-app/src/app/domains/server-directory/feature/server-search/server-search.component.ts

@@ -241,6 +241,7 @@ export class ServerSearchComponent implements OnInit {
       maxUsers: room.maxUsers ?? 50,
       hasPassword: typeof room.hasPassword === 'boolean' ? room.hasPassword : !!room.password,
       isPrivate: room.isPrivate,
+      channels: room.channels,
       createdAt: room.createdAt,
       ownerId: room.hostId,
       sourceId: room.sourceId,
@@ -272,7 +273,14 @@ export class ServerSearchComponent implements OnInit {
         sourceId: server.sourceId,
         sourceUrl: server.sourceUrl
       }));
-      const resolvedServer = response.server ?? server;
+      const resolvedServer = {
+        ...server,
+        ...response.server,
+        channels:
+          Array.isArray(response.server.channels) && response.server.channels.length > 0
+            ? response.server.channels
+            : server.channels
+      };
 
       this.closePasswordDialog();
       this.store.dispatch(

toju-app/src/app/features/servers/servers-rail.component.ts

@@ -311,7 +311,11 @@ export class ServersRailComponent {
           roomId: room.id,
           serverInfo: {
             ...this.toServerInfo(room),
-            ...response.server
+            ...response.server,
+            channels:
+              Array.isArray(response.server.channels) && response.server.channels.length > 0
+                ? response.server.channels
+                : room.channels
           }
         })
       );
@@ -370,6 +374,7 @@ export class ServersRailComponent {
       isPrivate: room.isPrivate,
       createdAt: room.createdAt,
       ownerId: room.hostId,
+      channels: room.channels,
       sourceId: room.sourceId,
       sourceName: room.sourceName,
       sourceUrl: room.sourceUrl

toju-app/src/app/store/rooms/rooms.effects.ts

@@ -117,6 +117,26 @@ function resolveUserDisplayName(user: Pick<User, 'displayName' | 'username'> | n
   return user?.username?.trim() || 'User';
 }
 
+function hasPersistedChannels(channels: Room['channels'] | undefined): channels is NonNullable<Room['channels']> {
+  return Array.isArray(channels) && channels.length > 0;
+}
+
+/** Keep cached channels until directory metadata provides a concrete replacement. */
+function resolveRoomChannels(
+  cachedChannels: Room['channels'] | undefined,
+  incomingChannels: Room['channels'] | undefined
+): Room['channels'] | undefined {
+  if (hasPersistedChannels(incomingChannels)) {
+    return incomingChannels;
+  }
+
+  if (hasPersistedChannels(cachedChannels)) {
+    return cachedChannels;
+  }
+
+  return undefined;
+}
+
 interface RoomPresenceSignalingMessage {
   type: string;
   reason?: string;
@@ -302,7 +322,7 @@ export class RoomsEffects {
                   const resolvedRoom: Room = {
                     ...room,
                     isPrivate: typeof serverInfo?.isPrivate === 'boolean' ? serverInfo.isPrivate : room.isPrivate,
-                    channels: Array.isArray(serverInfo?.channels) ? serverInfo.channels : room.channels,
+                    channels: resolveRoomChannels(room.channels, serverInfo?.channels),
                     sourceId: serverInfo?.sourceId ?? room.sourceId,
                     sourceName: serverInfo?.sourceName ?? room.sourceName,
                     sourceUrl: serverInfo?.sourceUrl ?? room.sourceUrl,
@@ -336,7 +356,7 @@ export class RoomsEffects {
                     createdAt: Date.now(),
                     userCount: 1,
                     maxUsers: 50,
-                    channels: Array.isArray(serverInfo.channels) ? serverInfo.channels : undefined,
+                    channels: resolveRoomChannels(undefined, serverInfo.channels),
                     sourceId: serverInfo.sourceId,
                     sourceName: serverInfo.sourceName,
                     sourceUrl: serverInfo.sourceUrl
@@ -361,7 +381,7 @@ export class RoomsEffects {
                         createdAt: serverData.createdAt || Date.now(),
                         userCount: serverData.userCount,
                         maxUsers: serverData.maxUsers,
-                        channels: Array.isArray(serverData.channels) ? serverData.channels : undefined,
+                        channels: resolveRoomChannels(undefined, serverData.channels),
                         sourceId: serverData.sourceId,
                         sourceName: serverData.sourceName,
                         sourceUrl: serverData.sourceUrl
@@ -428,7 +448,7 @@ export class RoomsEffects {
                 hasPassword: !!serverData.hasPassword,
                 isPrivate: serverData.isPrivate,
                 maxUsers: serverData.maxUsers,
-                channels: Array.isArray(serverData.channels) ? serverData.channels : room.channels,
+                channels: resolveRoomChannels(room.channels, serverData.channels),
                 sourceId: serverData.sourceId ?? room.sourceId,
                 sourceName: serverData.sourceName ?? room.sourceName,
                 sourceUrl: serverData.sourceUrl ?? room.sourceUrl