feat(mm): wait longer for a real opponent; add "start with bots now"

- server: a lone player in the online-league queue now keeps waiting (re-checking
  every 15s) up to 75s so an online opponent has a real chance to join; the moment
  a 2nd human queues they're matched together, and a full 4 still forms instantly.
  Add PlayNow hub method to force-start with bots on demand.
- client: matchmaking screen shows a "شروع با ربات / Start with bots" button after
  a few seconds so the player can skip the wait; waiting copy updated; raise the
  "connection stuck" hint threshold to 90s so it no longer fires during normal waits.

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

src/lib/online/mock-service.ts

@@ -984,6 +984,35 @@ export class MockOnlineService implements OnlineService {
     this.matchmaking.phase = "idle";
   }
 
+  async playNow() {
+    if (this.matchmaking.phase !== "searching" && this.matchmaking.phase !== "queued") return;
+    const me = this.profile!;
+    // Keep whoever has already joined; fill the remaining seats with bots.
+    const players = this.matchmaking.players.slice();
+    while (players.length < 4) {
+      players.push({
+        id: rid("bot"),
+        displayName: pick(PERSIAN_NAMES),
+        avatar: pick(AVATARS).id,
+        level: randInt(1, 50),
+        rating: me.rating + randInt(-150, 150),
+      });
+    }
+    this.matchmaking.players = players;
+    this.matchmaking.phase = "found";
+    this.emitMM();
+    this.after(700, () => {
+      if (this.matchmaking.phase !== "found") return;
+      this.matchmaking.phase = "ready";
+      this.matchPlayers = players.map((p) => ({
+        id: p.id, displayName: p.displayName, avatar: p.avatar, level: p.level,
+      }));
+      const opps = players.slice(1);
+      this.currentOppRating = opps.reduce((s, p) => s + p.rating, 0) / Math.max(1, opps.length);
+      this.emitMM();
+    });
+  }
+
   onMatchmaking(cb: (s: MatchmakingState) => void): Unsubscribe {
     this.mmCbs.add(cb);
     return () => this.mmCbs.delete(cb);