Merge floating particles into WebGL shader and fix color picker clipping

Remove overflow:hidden from .card and .template-card that was clipping
the color picker popover. Combine noise field + particle glow into a
single GPU shader pass (40 drifting particles as uniforms).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/wled_controller/static/css/streams.css

@@ -13,7 +13,6 @@
     border: 1px solid var(--border-color);
     border-radius: 8px;
     padding: 16px;
-    overflow: hidden;
     transition: box-shadow 0.2s ease, transform 0.2s ease;
     display: flex;
     flex-direction: column;