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/newton.js

@@ -149,8 +149,8 @@ class NewtonSim {
 
   /* ── Публичный API ───────────────────────────────────────── */
 
-  setLaw(n)    { this.law = n; this.scene = 'A'; this._resetAll(); if (this.onModeChange) this.onModeChange(); }
-  setScene(s)  { this.scene = s; this._resetAll(); }
+  setLaw(n)    { this.law = n; this.scene = 'A'; this._resetAll(); if (window.LabFX) LabFX.sound.play('click'); if (this.onModeChange) this.onModeChange(); }
+  setScene(s)  { this.scene = s; this._resetAll(); if (window.LabFX) LabFX.sound.play('click'); }
   setMu(v)     { this.mu = v; }
   setMass1(v)  { this.mass1 = v; this._reset3B(); }
   setMass2(v)  { this.mass2 = v; this._reset3B(); }
@@ -215,6 +215,7 @@ class NewtonSim {
   _tick(now) {
     const dt = Math.min((now - this._last) / 1000, 0.05);
     this._last = now;
+    if (window.LabFX) LabFX.particles.update(dt);
     if (!this._paused) {
       if      (this.law === 1 && this.scene === 'A') this._step1A(dt);
       else if (this.law === 1)                        this._step1B(dt);
@@ -448,6 +449,18 @@ class NewtonSim {
       p.x += p.vx * dt; p.y += p.vy * dt; p.life -= dt * 1.6;
     }
     s.particles = s.particles.filter(p => p.life > 0 && p.y < H + 20);
+
+    /* LabFX: rocket flame trail at nozzle */
+    if (window.LabFX) {
+      const nozzleX = W * 0.5;
+      const nozzleY = s.ry + 22;
+      LabFX.particles.emit({
+        ctx: this.ctx, x: nozzleX, y: nozzleY,
+        count: 3, color: ['#FFD166', '#FF6B35', '#EF476F'],
+        speed: 80, spread: Math.PI / 6, angle: Math.PI / 2,
+        gravity: -50, life: 400, glow: true, shape: 'spark',
+      });
+    }
   }
 
   /* ── Мышь ─────────────────────────────────────────────────── */
@@ -497,6 +510,9 @@ class NewtonSim {
     else if (this.scene === 'A')                    this._drawL3A(ctx);
     else if (this.scene === 'B')                    this._drawL3B(ctx);
     else                                            this._drawL3C(ctx);
+
+    /* LabFX: particles overlay */
+    if (window.LabFX) LabFX.particles.draw(this.ctx);
   }
 
   /* ── Закон I — Сцена A ───────────────────────────────────── */
@@ -659,9 +675,20 @@ class NewtonSim {
       this._block(ctx, bx, by, BW, BH, '#EF476F', `${this.mass1} кг`);
 
       /* Сила F */
+      const _fTipX = bx + BW / 2 + 48 + this.force * 0.9;
+      const _fTipY = by;
       this._arrow(ctx, bx + BW / 2, by,
-        bx + BW / 2 + 48 + this.force * 0.9, by,
+        _fTipX, _fTipY,
         '#EF476F', `F = ${this.force} Н`, 2.5);
+      /* LabFX: spark at force arrow tip (scene II A, running) */
+      if (window.LabFX && this._2.running && Math.random() < 0.25) {
+        LabFX.particles.emit({
+          ctx, x: _fTipX, y: _fTipY,
+          count: 5, color: '#FFD166', speed: 40,
+          spread: Math.PI / 2, angle: 0, life: 200,
+          glow: true, shape: 'spark',
+        });
+      }
 
       /* Ускорение a */
       const aLen = 32 + a1 * 5;