feat: add power-up mechanics and UI updates

- Introduced new power-up types with specific attributes (RAPID, COOL, SHIELD, TRIPLE).
- Enhanced difficulty settings to include power drop chances and pity kills.
- Implemented visual effects for power-ups, including floating animations and styling.
- Updated HUD to display power-up status, dash cooldowns, and venting mechanics for both players.
- Modified control instructions to include new actions for venting and dashing.
- Improved CSS for power-up visuals and dash trails.

Author: keevh

.gitignore

@@ -6,7 +6,5 @@ coverage/
 *.log
 .env*
 !.env.example
-AGENTS.md
 metadata.json
-pnpm-lock.yaml
-dist_respaldo
+pnpm-lock.yaml