Add per-recipient cooldown to QuickChatExecution (#4012)

`QuickChatExecution` had no cooldown, allowing a player to spam
quick-chat intents and flood a recipient's chat UI. This could bury
incoming alliance request notifications, preventing them from being seen
or accepted.

This fix mirrors the existing emoji cooldown pattern:

- Added `quickChatCooldown()` to `Config` (default: 30 ticks / 3 seconds)
- Added `canSendQuickChat(recipient)` and `recordQuickChat(recipient)`
to `Player` / `PlayerImpl`, tracking outgoing chats per recipient
- `QuickChatExecution.tick()` now checks `canSendQuickChat` before
displaying and records before the display calls (so the cooldown is
always written even if display throws)

src/core/configuration/Config.ts

@@ -513,6 +513,9 @@ export class Config {
   emojiMessageCooldown(): Tick {
     return 5 * 10;
   }
+  quickChatCooldown(): Tick {
+    return 3 * 10;
+  }
   targetDuration(): Tick {
     return 10 * 10;
   }

src/core/execution/QuickChatExecution.ts

@@ -27,8 +27,15 @@ export class QuickChatExecution implements Execution {
   }
 
   tick(ticks: number): void {
+    if (!this.sender.canSendQuickChat(this.recipient)) {
+      this.active = false;
+      return;
+    }
+
     const message = this.getMessageFromKey(this.quickChatKey);
 
+    this.sender.recordQuickChat(this.recipient);
+
     this.mg.displayChat(
       message[1],
       message[0],

src/core/game/Game.ts

@@ -808,6 +808,8 @@ export interface Player {
   canSendEmoji(recipient: Player | typeof AllPlayers): boolean;
   outgoingEmojis(): EmojiMessage[];
   sendEmoji(recipient: Player | typeof AllPlayers, emoji: string): void;
+  canSendQuickChat(recipient: Player): boolean;
+  recordQuickChat(recipient: Player): void;
 
   // Donation
   canDonateGold(recipient: Player): boolean;

src/core/game/PlayerImpl.ts

@@ -89,6 +89,7 @@ export class PlayerImpl implements Player {
   private targets_: Target[] = [];
 
   private outgoingEmojis_: EmojiMessage[] = [];
+  private outgoingQuickChats_ = new Map<number, Tick>();
 
   private sentDonations: Donation[] = [];
 
@@ -759,6 +760,21 @@ export class PlayerImpl implements Player {
     return true;
   }
 
+  canSendQuickChat(recipient: Player): boolean {
+    if (recipient === this) {
+      return false;
+    }
+    const lastSentAt = this.outgoingQuickChats_.get(recipient.smallID());
+    return (
+      lastSentAt === undefined ||
+      this.mg.ticks() - lastSentAt >= this.mg.config().quickChatCooldown()
+    );
+  }
+
+  recordQuickChat(recipient: Player): void {
+    this.outgoingQuickChats_.set(recipient.smallID(), this.mg.ticks());
+  }
+
   canDonateGold(recipient: Player): boolean {
     if (
       !this.isAlive() ||