feat(labs): visual polish wave — LabFX foundation + 33 sims juiced up

ФУНДАМЕНТ (4 новых файла):
- _fx_core.js: LabFX namespace, glow.drawGlow, glow.pulse, haptic, shake
- _fx_particles.js: пул 1500 объектов, 6 shapes (dot/spark/ring/smoke/splash/dust)
- _fx_motion.js: tween + 12 easings + critically-damped spring
- _fx_sound.js: 9 procedural synth-звуков (click/tick/whoosh/chime/fizz/spark/bounce/pour/drone), Web Audio API
- Sound toggle в шапке lab.html с localStorage-persist

UX МИКРО (CSS + JS):
- Button states: hover scale+brightness, active scale-down, disabled grayscale
- Slider polish: custom thumb с тенью, filled-track gradient, hover/active
- Focus rings через :focus-visible
- Tooltip system .tt-host data-tt= с 400ms hover, fade-in
- Marching ants для selection
- Loading skeleton с shimmer
- Empty state .sim-empty-* паттерн
- Toast: progress bar внизу, icons по типу
- Cursor states utility classes
- View Transitions API для smooth sim-switch, fallback на CSS fade

PHASE 2 — визуальные эффекты для 33 симуляций:

Physics motion: projectile (launch whoosh + landing splash/shake/haptic + target chime), pendulum (max-extension tick + bob glow), collision (bounce + sparks + shake), angrybirds (whoosh/bounce/fizz/chime + confetti), newton (rocket flame trail + scene transitions), forcesandbox (spring glow + impact sparks)

Physics fields: emfield (field-lines glow + particle trail + lightning при high field + Gauss-drag haptic + rod motion sparks), circuit (energized-wire glow ∝ current + LED bloom + short-circuit shake/spark + heat shimmer smoke + place/erase/switch sounds), opticsbench (beam glow на всех режимах + caustics dust у фокуса + TIR/Brewster one-shot sounds)

Thermo+waves: waves (mode-switch whoosh + Mach-cone particles + spectrum harmonic chime + waveform glow), hydrostatics (pour sound + splash при погружении + valve click), isoprocess (PV-trail dust), heatengine (drone цикла + hot/cold reservoir smoke/dust + phase-change ticks), radioactive (Geiger tick throttle + decay sparks + half-life chime + α/β/γ glow)

Chemistry: chemsandbox (pour splash + fizz bubbles/dust/spark по типу реакции + shake при горении), equilibrium/electrolysis/reactions/titration/flask/ionexchange/redox (pour/fizz/spark/chime по событиям, частицы при ключевых моментах), stoichiometry (fizz bubbles + recipe-change click)

Math+geom: geometry (tool-click + object-create tick + locus glow + challenge confetti via LabFX + haptic), triangle (vertex-drop tick + special-point glow), stereo (figure-change whoosh + cross-section chime, no particles — Three.js), trigcircle (drag-haptic + pitch∝angle tick + sin/cos glow), graph/graphtransform/quadratic (slider-tick throttled + curve glow + discriminant-cross chime), probability (bounce + finish-chime burst), normaldist (pulsing shade + bell glow)

Bio+misc: celldivision (phase-change whoosh + prophase dust + anaphase poles spark + cytokinesis chime), photosynthesis (photon tick + ATP chime + glucose sparkle), bohratom (electron-jump chime ∝ levels + photon spark), orbitals/crystal (mode-change whoosh — Three.js, sound only), logic (gate-place + wire-connect + LED bloom + HIGH wire flowing dots + preset chime), gas/brownian/diffusion/states (preset whoosh, throttled tick по событиям)

Все LabFX вызовы обёрнуты в if (window.LabFX) guard — graceful degradation если фундамент не загружен. 47 JS файлов прошли syntax check.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/js/labs/reactions.js

@@ -95,8 +95,12 @@ class ReactionSim {
 
   start() {
     if (this._raf) return;
-    const loop = () => {
+    this._lastTs = performance.now();
+    const loop = (ts) => {
       this._raf = requestAnimationFrame(loop);
+      const dt = Math.min((ts - this._lastTs) / 1000, 0.05);
+      this._lastTs = ts;
+      if (window.LabFX) LabFX.particles.update(dt);
       for (let i = 0; i < 3; i++) this._step();
       this.draw();
     };
@@ -317,6 +321,19 @@ class ReactionSim {
 
     this._totalReactions++;
     this._recentReactions++;
+
+    // LabFX: flash spark + throttled tick sound at collision point
+    if (window.LabFX) {
+      const now = performance.now();
+      if (!this._fxLastTick || now - this._fxLastTick > 200) {
+        this._fxLastTick = now;
+        LabFX.sound.play('tick', { volume: 0.1 });
+      }
+      LabFX.particles.emit({ ctx: this.ctx, x: cx, y: cy, count: 3,
+        color: '#FFD166', speed: 45, spread: 3.14, angle: 0,
+        gravity: 0, life: 200, shape: 'spark', glow: true });
+    }
+
     return true;
   }
 
@@ -380,6 +397,8 @@ class ReactionSim {
       ctx.textAlign = 'center';
       ctx.fillText('Все молекулы прореагировали — нажмите Сброс', W / 2, H / 2);
     }
+
+    if (window.LabFX) LabFX.particles.draw(ctx);
   }
 
   _drawParticle(ctx, p) {
@@ -687,6 +706,7 @@ class ReactionSim {
   }
 
   function chemReset() {
+    if (window.LabFX) LabFX.sound.play('whoosh', { volume: 0.3 });
     if (_chemMode === 'kinetics' && reacSim)  reacSim.reset();
     if (_chemMode === 'flask'    && flaskSim) flaskSim.reset();
     if (_chemMode === 'redox')   redoxReset();
@@ -716,6 +736,7 @@ class ReactionSim {
   }
 
   function reacMode(mode, el) {
+    if (window.LabFX) LabFX.sound.play('click');
     if (reacSim) reacSim.setMode(mode);
     document.querySelectorAll('.reac-mode-btn').forEach(b => b.classList.remove('active'));
     if (el) el.classList.add('active');
@@ -827,6 +848,7 @@ class ReactionSim {
   }
 
   function redoxReset() {
+    if (window.LabFX) LabFX.sound.play('whoosh', { volume: 0.3 });
     if (rdxSim) rdxSim.reset();
   }
 
@@ -858,6 +880,7 @@ class ReactionSim {
   }
 
   function ionexReset() {
+    if (window.LabFX) LabFX.sound.play('whoosh', { volume: 0.3 });
     if (ioxSim) ioxSim.reset();
   }