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/lab.html

@@ -342,6 +342,22 @@
         <button class="zoom-btn" id="theory-toggle" onclick="toggleTheory()" title="Теория и формулы" style="margin-left:auto">
           <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.2"><path d="M2 3h6a4 4 0 014 4v14a3 3 0 00-3-3H2z"/><path d="M22 3h-6a4 4 0 00-4 4v14a3 3 0 013-3h7z"/></svg>
         </button>
+
+        <!-- sound toggle -->
+        <button class="zoom-btn" id="labfx-sound-btn" onclick="(function(){var e=window.LabFX&&window.LabFX.sound;if(!e)return;e.setEnabled(!e.isEnabled());document.getElementById('labfx-sound-btn').setAttribute('aria-pressed',e.isEnabled());document.getElementById('labfx-sound-icon-on').style.display=e.isEnabled()?'':'none';document.getElementById('labfx-sound-icon-off').style.display=e.isEnabled()?'none':'';})()" title="Звук симуляций" style="position:relative" aria-pressed="true">
+          <!-- speaker on -->
+          <svg id="labfx-sound-icon-on" class="ic" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+            <polygon points="11 5 6 9 2 9 2 15 6 15 11 19 11 5"/>
+            <path d="M15.54 8.46a5 5 0 0 1 0 7.07"/>
+            <path d="M19.07 4.93a10 10 0 0 1 0 14.14"/>
+          </svg>
+          <!-- speaker off (muted) -->
+          <svg id="labfx-sound-icon-off" class="ic" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" style="display:none">
+            <polygon points="11 5 6 9 2 9 2 15 6 15 11 19 11 5"/>
+            <line x1="23" y1="9" x2="17" y2="15"/>
+            <line x1="17" y1="9" x2="23" y2="15"/>
+          </svg>
+        </button>
       </div>
 
       <!-- ── GRAPH sim body ── -->
@@ -3940,6 +3956,10 @@
 <script src="/js/api.js"></script>
   <script src="/js/sidebar.js"></script>
 <script src="https://cdn.jsdelivr.net/npm/three@0.149.0/build/three.min.js"></script>
+<script src="/js/labs/_fx_core.js"></script>
+<script src="/js/labs/_fx_particles.js"></script>
+<script src="/js/labs/_fx_motion.js"></script>
+<script src="/js/labs/_fx_sound.js"></script>
 <script src="/js/labs/graph.js"></script>
 <script src="/js/labs/emfield.js"></script>
 <script src="/js/labs/triangle.js"></script>
@@ -3989,5 +4009,19 @@
 <script src="/js/labs/geometry.js"></script>
 <script src="/js/labs/logic.js"></script>
 <script src="/js/labs/heatengine.js"></script>
+<script>
+  /* Sync sound toggle button icon with localStorage state on load */
+  (function() {
+    var stored = localStorage.getItem('labfx-sound');
+    var on = stored === null ? true : stored === 'true';
+    var iconOn  = document.getElementById('labfx-sound-icon-on');
+    var iconOff = document.getElementById('labfx-sound-icon-off');
+    var btn     = document.getElementById('labfx-sound-btn');
+    if (!iconOn || !iconOff || !btn) return;
+    iconOn.style.display  = on ? '' : 'none';
+    iconOff.style.display = on ? 'none' : '';
+    btn.setAttribute('aria-pressed', on ? 'true' : 'false');
+  })();
+</script>
 </body>
 </html>