Halloween Event (#2285)

## Description:

Changed theme colors for an "autumn" ambiance:

<img width="395" height="254" alt="image"
src="https://github.com/user-attachments/assets/67bd07d3-e74b-49e2-ba0b-c87958767d45"
/>

Changed structures pixel art:

<img width="756" height="605" alt="image"
src="https://github.com/user-attachments/assets/5158ae81-0641-413c-8862-367259496a9a"
/>


Change existing FX with new halloween-themed ones:


https://github.com/user-attachments/assets/fb99be49-43cd-4d85-ad77-8c153070edaf

Added new FX playing randomly on the map:


https://github.com/user-attachments/assets/16631113-77e6-4b8c-b1b6-c147f5f1d275

Added a couple of new emojis, which are used by the bots when attacked:
👻🎃

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

IngloriousTom

src/core/execution/utils/BotBehavior.ts

@@ -20,7 +20,7 @@ const EMOJI_ASSIST_ACCEPT = (["👍", "⛵", "🤝", "🎯"] as const).map(emoji
 const EMOJI_RELATION_TOO_LOW = (["🥱", "🤦‍♂️"] as const).map(emojiId);
 const EMOJI_TARGET_ME = (["🥺", "💀"] as const).map(emojiId);
 const EMOJI_TARGET_ALLY = (["🕊️", "👎"] as const).map(emojiId);
-export const EMOJI_HECKLE = (["🤡", "😡"] as const).map(emojiId);
+export const EMOJI_HECKLE = (["👻", "🎃"] as const).map(emojiId);
 
 export class BotBehavior {
   private enemy: Player | null = null;