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/pendulum.js

@@ -82,6 +82,7 @@ class PendulumSim {
     this._tSim = 0;
     this._clearTrail();
     this._eHistory = [];
+    if (window.LabFX) LabFX.sound.play('click');
     this.draw();
     this._emit();
   }
@@ -116,9 +117,17 @@ class PendulumSim {
       this._lastTs = ts;
       const dt = rawDt * this.speed;
 
+      const prevOmega = this.omega;
       this._step(dt);
       this._tSim += dt;
 
+      if (window.LabFX) LabFX.particles.update(rawDt);
+
+      /* LabFX: tick sound at maximum extension (velocity sign flip) */
+      if (window.LabFX && prevOmega !== 0 && Math.sign(this.omega) !== Math.sign(prevOmega)) {
+        LabFX.sound.play('tick', { pitch: 1.2, volume: 0.2 });
+      }
+
       // trail
       const { bx, by } = this._bobPos();
       this._trail.push({ x: bx, y: by });
@@ -195,16 +204,23 @@ class PendulumSim {
 
     // bob
     const bobR = 18;
-    ctx.fillStyle = '#9B5DE5';
-    ctx.beginPath(); ctx.arc(bx, by, bobR, 0, Math.PI * 2); ctx.fill();
-    ctx.strokeStyle = 'rgba(255,255,255,0.5)'; ctx.lineWidth = 2; ctx.stroke();
+    const _drawBob = () => {
+      ctx.fillStyle = '#9B5DE5';
+      ctx.beginPath(); ctx.arc(bx, by, bobR, 0, Math.PI * 2); ctx.fill();
+      ctx.strokeStyle = 'rgba(255,255,255,0.5)'; ctx.lineWidth = 2; ctx.stroke();
 
-    // glow
-    const grad = ctx.createRadialGradient(bx, by, 0, bx, by, bobR * 2);
-    grad.addColorStop(0, 'rgba(155,93,229,0.25)');
-    grad.addColorStop(1, 'rgba(155,93,229,0)');
-    ctx.fillStyle = grad;
-    ctx.beginPath(); ctx.arc(bx, by, bobR * 2, 0, Math.PI * 2); ctx.fill();
+      // glow
+      const grad = ctx.createRadialGradient(bx, by, 0, bx, by, bobR * 2);
+      grad.addColorStop(0, 'rgba(155,93,229,0.25)');
+      grad.addColorStop(1, 'rgba(155,93,229,0)');
+      ctx.fillStyle = grad;
+      ctx.beginPath(); ctx.arc(bx, by, bobR * 2, 0, Math.PI * 2); ctx.fill();
+    };
+    if (window.LabFX) {
+      LabFX.glow.drawGlow(ctx, _drawBob, { color: '#9B5DE5', intensity: 8 });
+    } else {
+      _drawBob();
+    }
 
     // angle arc
     if (Math.abs(this.theta) > 0.02) {
@@ -233,6 +249,9 @@ class PendulumSim {
 
     // energy chart
     this._drawEnergyChart(ctx, W, H);
+
+    /* LabFX: particles overlay */
+    if (window.LabFX) LabFX.particles.draw(ctx);
   }
 
   _drawTrail(ctx) {