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/isoprocess.js

@@ -54,7 +54,13 @@ class IsoprocessSim {
     this.W = w; this.H = h;
   }
 
-  setProcess(p) { this.process = p; this.draw(); this._emit(); }
+  setProcess(p) {
+    this.process = p;
+    if (window.LabFX) LabFX.sound.play('click');
+    this._dustFrame = 0;
+    this.draw();
+    this._emit();
+  }
   setGamma(g)   { this.gamma = +g; this.draw(); this._emit(); }
   getParams() { return { P1: this.P1, V1: this.V1, process: this.process }; }
   setParams({ P1, V1 } = {}) {
@@ -158,6 +164,30 @@ class IsoprocessSim {
     this._drawActiveCurve(ctx);
     this._drawPoints(ctx);
     this._drawInfoBox(ctx);
+    /* emit dust particle along PV curve every ~5 draw calls */
+    if (window.LabFX) {
+      this._dustFrame = (this._dustFrame || 0) + 1;
+      if (this._dustFrame % 5 === 0) {
+        const { P2, V2 } = this._state2();
+        /* interpolated point at 50% of curve for dust */
+        const u = ((this._dustFrame / 5) % 10) / 10;
+        let px, py;
+        switch (this.process) {
+          case 'isothermal': { const v = this.V1 + u * (V2 - this.V1); px = this._vx(v); py = this._py(this.P1 * this.V1 / v); break; }
+          case 'isochoric':  { px = this._vx(this.V1); py = this._py(this.P1 + u * (P2 - this.P1)); break; }
+          case 'isobaric':   { const v2 = this.V1 + u * (V2 - this.V1); px = this._vx(v2); py = this._py(this.P1); break; }
+          case 'adiabatic':  { const v3 = this.V1 + u * (V2 - this.V1); px = this._vx(v3); py = this._py(this.P1 * Math.pow(this.V1 / v3, this.gamma)); break; }
+          default: px = this._vx(this.V1); py = this._py(this.P1);
+        }
+        LabFX.particles.emit({
+          ctx, x: px, y: py,
+          count: 1, color: '#06D6E0', speed: 8,
+          spread: Math.PI * 2, angle: 0, gravity: 0,
+          life: 300, shape: 'dust', size: 2,
+        });
+      }
+      LabFX.particles.draw(ctx);
+    }
   }
 
   _drawGrid(ctx) {
@@ -488,6 +518,7 @@ class IsoprocessSim {
     document.querySelectorAll('.iso-proc-btn').forEach(b => b.classList.remove('active'));
     if (el) el.classList.add('active');
     if (isoSim) isoSim.setProcess(proc);
+    /* sound already emitted inside setProcess */
   }
 
   function isoGamma(g, el) {