feat: Allow admin to create new text channels

toju-app/src/app/domains/chat/README.md

@@ -90,6 +90,12 @@ sequenceDiagram
     User->>DC: broadcastMessage(delete-message)
 ```
 
+## Text channel scoping
+
+`ChatMessagesComponent` renders only the active text channel selected in `store/rooms`. Legacy messages without an explicit `channelId` are treated as `general` for backward compatibility, while new sends and typing events attach the active `channelId` so one text channel does not leak state into the rest of the server.
+
+If a room has no text channels, the room shell in `features/room/chat-room/` renders an empty state instead of mounting the chat view. The chat domain only mounts once a valid text channel exists.
+
 ## Message sync
 
 When a peer connects (or reconnects), both sides exchange an inventory of their recent messages so each can request anything it missed. The inventory is capped at 1 000 messages and sent in chunks of 200.
@@ -140,4 +146,4 @@ graph LR
 
 ## Typing indicator
 
-`TypingIndicatorComponent` listens for typing events from peers. Each event resets a 3-second TTL timer. If no new event arrives within 3 seconds, the user is removed from the typing list. At most 4 names are shown; beyond that it displays "N users are typing".
+`TypingIndicatorComponent` listens for typing events from peers scoped to the current server and active text channel. Each event resets a 3-second TTL timer for that channel. If no new event arrives within 3 seconds, the user is removed from the typing list. At most 4 names are shown; beyond that it displays "N users are typing".

toju-app/src/app/domains/chat/feature/chat-messages/chat-messages.component.ts

@@ -108,8 +108,18 @@ export class ChatMessagesComponent {
   }
 
   handleTypingStarted(): void {
+    const roomId = this.currentRoom()?.id;
+
+    if (!roomId) {
+      return;
+    }
+
     try {
-      this.webrtc.sendRawMessage({ type: 'typing', serverId: this.webrtc.currentServerId });
+      this.webrtc.sendRawMessage({
+        type: 'typing',
+        serverId: roomId,
+        channelId: this.activeChannelId() ?? 'general'
+      });
     } catch {
       /* ignore */
     }

toju-app/src/app/domains/chat/feature/typing-indicator/typing-indicator.component.ts

@@ -9,7 +9,10 @@ import {
 import { takeUntilDestroyed } from '@angular/core/rxjs-interop';
 import { Store } from '@ngrx/store';
 import { RealtimeSessionFacade } from '../../../../core/realtime';
-import { selectCurrentRoom } from '../../../../store/rooms/rooms.selectors';
+import {
+  selectActiveChannelId,
+  selectCurrentRoom
+} from '../../../../store/rooms/rooms.selectors';
 import {
   merge,
   interval,
@@ -27,6 +30,7 @@ interface TypingSignalingMessage {
   displayName: string;
   oderId: string;
   serverId: string;
+  channelId?: string;
 }
 
 @Component({
@@ -39,10 +43,12 @@ interface TypingSignalingMessage {
   }
 })
 export class TypingIndicatorComponent {
-  private readonly typingMap = new Map<string, { name: string; expiresAt: number }>();
+  private readonly typingMap = new Map<string, { name: string; channelId: string; expiresAt: number }>();
   private readonly store = inject(Store);
   private readonly currentRoom = this.store.selectSignal(selectCurrentRoom);
+  private readonly activeChannelId = this.store.selectSignal(selectActiveChannelId);
   private lastRoomId: string | null = null;
+  private lastConversationKey: string | null = null;
 
   typingDisplay = signal<string[]>([]);
   typingOthersCount = signal<number>(0);
@@ -60,9 +66,13 @@ export class TypingIndicatorComponent {
       filter((msg) => msg.serverId === this.currentRoom()?.id),
       tap((msg) => {
         const now = Date.now();
+        const channelId = typeof msg.channelId === 'string' && msg.channelId.trim()
+          ? msg.channelId.trim()
+          : 'general';
 
-        this.typingMap.set(msg.oderId, {
+        this.typingMap.set(`${channelId}:${msg.oderId}`, {
           name: msg.displayName,
+          channelId,
           expiresAt: now + TYPING_TTL
         });
       })
@@ -89,20 +99,27 @@ export class TypingIndicatorComponent {
 
     effect(() => {
       const roomId = this.currentRoom()?.id ?? null;
+      const activeChannelId = this.activeChannelId() ?? 'general';
+      const conversationKey = roomId ? `${roomId}:${activeChannelId}` : null;
 
-      if (roomId === this.lastRoomId)
+      if (roomId !== this.lastRoomId) {
+        this.lastRoomId = roomId;
+        this.typingMap.clear();
+      }
+
+      if (conversationKey === this.lastConversationKey)
         return;
 
-      this.lastRoomId = roomId;
-      this.typingMap.clear();
+      this.lastConversationKey = conversationKey;
       this.recomputeDisplay();
     });
   }
 
   private recomputeDisplay(): void {
     const now = Date.now();
+    const activeChannelId = this.activeChannelId() ?? 'general';
     const names = Array.from(this.typingMap.values())
-      .filter((e) => e.expiresAt > now)
+      .filter((entry) => entry.expiresAt > now && entry.channelId === activeChannelId)
       .map((e) => e.name);
 
     this.typingDisplay.set(names.slice(0, MAX_SHOWN));