feat(effects): extinguish fire with water/rain and ambient SFX volume

Water and rain erase fire under a tight brush hit radius; add looping fire/rain ambients and an Effects sound slider that also scales one-shot effect SFX.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/renderer/control/sunbeamSfx.ts

@@ -1,5 +1,7 @@
 /** Звук эффекта «Луч света» (`public/luch_sveta.mp3`). */
 
+import { getEffectsSfxGain } from './effectsSfxGain';
+
 const SUNBEAM_SFX_VOLUME = 0.88;
 /** Воспроизведение на 50% быстрее → реальная длительность = файл / 1.5. */
 export const SUNBEAM_PLAYBACK_RATE = 1.5;
@@ -47,7 +49,7 @@ export async function getSunbeamEffectLifeMs(): Promise<number> {
 export function playSunbeamEffectSound(): void {
   try {
     const el = new Audio(sunbeamEffectSoundUrl());
-    el.volume = SUNBEAM_SFX_VOLUME;
+    el.volume = Math.max(0, Math.min(1, SUNBEAM_SFX_VOLUME * getEffectsSfxGain()));
     el.playbackRate = SUNBEAM_PLAYBACK_RATE;
     void el.play().catch(() => undefined);
   } catch {