feat(effects): migrate battle effects to VFX

- add WebP frame-sequence assets for lightning, electric accent, fire, sunbeam, poison, rain, water, and rounded fog effects
- replace procedural lightning rendering with VFX frame playback
- align lightning impact to the click point
- remove the full-screen lightning blur/flash overlay
- add electric accent playback for lightning impact dispersion
- keep lightning scorch marks as the persistent ground trace after the action effect
- consolidate the lightning tool into a single public `Молния` action
- replace procedural fire with the VFX fire implementation
- remove the separate `Огонь 2` tool and keep the VFX fire under `Огонь`
- keep VFX fire brightness fixed at full intensity
- preserve fire as a field effect with brush placement and eraser support
- replace procedural sunbeam with the Pulse Discharge VFX implementation
- remove the separate `Луч света 2` tool and keep the VFX sunbeam under `Луч света`
- align sunbeam impact to the click point instead of the raw frame center
- remove the full-screen sunbeam flash overlay
- add Dust Burst VFX playback for poison cloud
- tint poison smoke green
- keep the skull glyph rendered above the poison smoke
- align poison smoke bottom to the click point
- remove the old procedural poison cloud implementation
- remove the separate `Яд 2` tool and keep the VFX poison under `Яд`
- replace procedural rain strokes with medium-rain VFX frame playback
- recolor rain frames to gray/light-gray so rain no longer renders black
- preserve rain as a field effect with brush placement and eraser support
- replace static water fill with generated animated water VFX frames
- render water VFX through the existing stroke mask so water keeps the painted brush shape
- preserve water as a field effect with brush placement and eraser support
- replace procedural fog texture generation with Smokey Atmosphere VFX frames
- generate rounded fog VFX frames with soft alpha falloff at the edges
- size each fog VFX stamp to the brush diameter
- remove per-stamp fog drift and rotation so fog elements stay fixed in place
- keep fog animation limited to internal frame playback
- preload VFX frame textures for smoother first use
- cache VFX textures per Pixi instance to avoid duplicate decoding
- filter expired action instances before node synchronization to stop old effects from flashing back during rapid casts
- add brush-stroke erasing for field effects using the same model as scene darkness reveal
- keep whole-instance erasing for action effects
- update effect hit tests for the consolidated VFX action effects
- update effect store pruning for renamed and consolidated action effects
- update control-panel buttons for consolidated fire, sunbeam, poison, and VFX-backed field effects
- update editor localization for removed and renamed effect tools
- add tests for field-effect brush erasing
- update eraser hit-test coverage for VFX-backed effects
- update effects store lifetime pruning tests for consolidated poison
- update control-panel tests for consolidated effect buttons
- include the field-effect eraser test in the default test script

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

app/main/effects/effectsStore.ts

@@ -1,5 +1,6 @@
 import crypto from 'node:crypto';
 
+import { applyFieldEffectEraserStroke } from '../../shared/fieldEffectEraser';
 import type { EffectsEvent, EffectsState, EffectToolState } from '../../shared/types';
 
 function nowMs(): number {
@@ -35,7 +36,7 @@ export class EffectsStore {
 
   dispatch(event: EffectsEvent): EffectsState {
     const s = this.state;
-    const next: EffectsState = applyEvent(s, event);
+    const next: EffectsState = applyEvent(s, event, (prefix) => this.makeId(prefix));
     this.state = next;
     return next;
   }
@@ -47,13 +48,18 @@ export class EffectsStore {
     const kept = this.state.instances.filter((i) => {
       // Пятно льда не истекает по таймеру (только «очистить все» или ластик в UI).
       if (i.type === 'ice' || i.type === 'shadow') return true;
-      if (i.type === 'lightning' || i.type === 'sunbeam' || i.type === 'poisonCloud' || i.type === 'darkness') {
+      if (
+        i.type === 'lightning' ||
+        i.type === 'sunbeam' ||
+        i.type === 'poisonCloud' ||
+        i.type === 'darkness'
+      ) {
         return now - i.createdAtMs < i.lifetimeMs;
       }
       if (i.type === 'scorch') {
         return now - i.createdAtMs < i.lifetimeMs;
       }
-      if (i.type === 'fog' || i.type === 'water') {
+      if (i.type === 'fog' || i.type === 'fire' || i.type === 'rain' || i.type === 'water') {
         if (i.lifetimeMs === null) return true;
         return now - i.createdAtMs < i.lifetimeMs;
       }
@@ -74,7 +80,11 @@ export class EffectsStore {
   }
 }
 
-function applyEvent(state: EffectsState, event: EffectsEvent): EffectsState {
+function applyEvent(
+  state: EffectsState,
+  event: EffectsEvent,
+  makeId: (prefix: string) => string,
+): EffectsState {
   const bump = (patch: Omit<EffectsState, 'revision' | 'serverNowMs'>): EffectsState => ({
     ...patch,
     revision: state.revision + 1,
@@ -89,6 +99,11 @@ function applyEvent(state: EffectsState, event: EffectsEvent): EffectsState {
       return bump({ ...state, instances: [...state.instances, event.instance] });
     case 'instance.remove':
       return bump({ ...state, instances: state.instances.filter((i) => i.id !== event.id) });
+    case 'field.erase':
+      return bump({
+        ...state,
+        instances: applyFieldEffectEraserStroke(state.instances, event.points, event.radiusN, makeId),
+      });
     default: {
       // Exhaustiveness
       // eslint-disable-next-line @typescript-eslint/no-unused-vars