True style synthesizer, success effects, granular intro, dark selects

- New style button now runs a 12-gene genome renderer (6 fields x 5
  domain geometries x 4 color maps x 4 shading models x 4 overlays)
  producing standalone styles instead of blending existing modes
- Share codes v3 carry the genome, v1/v2 codes still decode
- Download completion fires a palette-colored particle burst, pulse
  ring and animated success check toast
- Intro animation staggers every individual control, compositor-only
- color-scheme dark fixes white native select dropdowns in modals
- Sharper liquid-glass diamond favicon and touch icons

Co-authored-by: Cursor <cursoragent@cursor.com>

docs.html

@@ -101,7 +101,7 @@
   <div class="docs-section">
     <h2>Styles</h2>
     <p>Pick one of the 9 base styles in the <strong>Style</strong> section: Chrome, Silk, Bloom, Aura, Rays, Halftone, Glyphs, Reeded and Mosaic. Each one is its own renderer with its own character.</p>
-    <p><strong>Synth styles</strong> go beyond the base set: <code>New synth style</code> blends two renderers with a random mix operation (organic mask, screen, multiply, radial or diagonal split) into a completely new look. The <strong>Synth blend</strong> slider controls how strongly the second layer shows. The big <strong>Randomize</strong> button also produces synth styles some of the time.</p>
+    <p><strong>Generated styles</strong> go far beyond the base set: <code>New style</code> runs a style synthesizer with 12 genes covering field type, domain geometry, color mapping, shading model and surface overlay. Every gene set is a standalone style that does not exist in the base nine, named by its field archetype: FLUX, RIDGE, WAVE, RING, CELL or FLOW. The big <strong>Randomize</strong> button also discovers new styles some of the time.</p>
     <p>Found something you love? <code>Save style</code> stores it in your browser. Saved styles appear as chips you can reload with one click, and they survive page reloads.</p>
   </div>