P14b: session chat (table + whispers) + saved campaign recap

- Sidebar gains tabs: Chat / Rolls / (GM) Recap. Chat supports table messages and
  private whispers (GM→player via a recipient picker; player→GM via a toggle).
  Server routes table to all and whispers to the target only (+server tests).
- Rolls + chat are persisted to a per-campaign session recap (Dexie v13 sessionLog
  table + sessionLogRepo); the GM's "Recap" tab shows it (survives reloads/sessions).
- wsSync: chat send/receive, optimistic local echo, persistLog for the GM.
- Realtime e2e: GM table message reaches the player; the player's reply reaches the GM.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

server/src/rooms.ts

@@ -222,6 +222,32 @@ export class RoomHub {
     for (const p of room.players) p.send(msg); // players only; the GM already sees it locally
   }
 
+  /** Table chat (to all) or a whisper. GM `to` = target player; player `to` set = whisper to GM. */
+  chat(socket: Sender, body: string, to?: string): void {
+    const conn = this.conns.get(socket);
+    const room = conn ? this.rooms.get(conn.roomId) : undefined;
+    if (!conn || !room) return;
+    room.lastActivity = this.now();
+    if (conn.role === 'gm') {
+      if (to) {
+        const msg = { t: 'chat', from: 'GM', body, scope: 'whisper' } as const;
+        for (const [s, c] of this.conns) if (c.roomId === room.roomId && c.playerId === to) s.send(msg);
+      } else {
+        const msg = { t: 'chat', from: 'GM', body, scope: 'table' } as const;
+        for (const p of room.players) p.send(msg);
+      }
+    } else {
+      const from = room.seats.get(conn.playerId)?.name ?? `Player ${conn.playerId.slice(0, 4)}`;
+      if (to) {
+        room.gm?.send({ t: 'chat', from, body, scope: 'whisper' });
+      } else {
+        const msg = { t: 'chat', from, body, scope: 'table' } as const;
+        room.gm?.send(msg);
+        for (const p of room.players) if (p !== socket) p.send(msg);
+      }
+    }
+  }
+
   disconnect(socket: Sender): void {
     const conn = this.conns.get(socket);
     if (!conn) return;