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/gas.js

@@ -24,6 +24,10 @@ class GasSim {
     this._hover       = null;  // hovered particle
     this._pistonDrag  = false;
 
+    // LabFX throttle
+    this._fxPressureTimer = 0;
+    this._fxLastT = 0;
+
     canvas.addEventListener('mousemove',  e => this._onMouseMove(e));
     canvas.addEventListener('mouseleave', () => { this._hover = null; this._pistonDrag = false; });
     canvas.addEventListener('mousedown',  e => this._onMouseDown(e));
@@ -116,9 +120,21 @@ class GasSim {
   stop()  { cancelAnimationFrame(this._raf); this._raf = null; }
 
   // ── simulation ──────────────────────────────────────────────────────────────
-  _loop() {
+  _loop(now) {
+    const dt = this._fxLastT ? Math.min(now - this._fxLastT, 80) : 16;
+    this._fxLastT = now;
     this._step();
     this._step();
+    if (window.LabFX) {
+      LabFX.particles.update(dt);
+      // throttled pressure tick sound (~every 150ms, proportional to pressure)
+      this._fxPressureTimer += dt;
+      if (this._fxPressureTimer >= 150) {
+        this._fxPressureTimer = 0;
+        const P = parseFloat(this.info().P);
+        if (P > 5) LabFX.sound.play('tick', { volume: 0.05 });
+      }
+    }
     this.draw();
     this._raf = requestAnimationFrame(this._loop);
   }
@@ -318,6 +334,8 @@ class GasSim {
 
     // Histogram
     this._drawHistogram(ctx, W, H);
+
+    if (window.LabFX) LabFX.particles.draw(ctx);
   }
 
   _drawPiston(ctx, pistonX, H) {
@@ -517,6 +535,7 @@ class GasSim {
   }
 
   function molReset() {
+    if (window.LabFX) LabFX.sound.play('click');
     if (_molMode === 'gas' && gasSim) {
       gasSim.reset();
       document.getElementById('sl-gPiston').value = 100;
@@ -620,6 +639,10 @@ class GasSim {
   function statesPreset(t) {
     document.getElementById('sl-stT').value = Math.round(t * 100);
     document.getElementById('st-T').textContent = t.toFixed(2);
+    if (window.LabFX) {
+      const stateIdx = t < 0.2 ? 0 : t < 0.5 ? 1 : 2;
+      LabFX.sound.play('whoosh', { pitch: [0.7, 1.0, 1.3][stateIdx], volume: 0.3 });
+    }
     if (statesSim) statesSim.setT(t);
   }