Effects engine, SVG/VU/silhouette categories, pad bank, MP4 recording, dual-window UI

- Parametric effect engine: 23 shader families × palettes × variants (~2300 presets)
  with a filterable library and an effect sequence (auto-cycle by time or beat).
- Effect categories: fractals/abstract, dancing silhouettes, SVG/Image source
  (loads any SVG/image as a recolourable audio-reactive effect; 50+ bundled CC0 SVGs),
  and VU-Meter (32-band spectrum bars, analogue needle, stereo LEDs).
- Dual-window architecture: control panel + fullscreen output on an external display
  (reliable via simple-fullscreen); tabbed control UI (Audio, Effetti, Pad, Immagini,
  Testo, Registra, Schermo).
- Audio: file playback + live input + output device selection, per-band visual EQ,
  audio playlist (reorder, hotkeys, per-track play/pause, repeat).
- Pad bank: 5×4 launchpad with persistent assignments; pressing a pad stops the current.
- Overlays: slideshow images (resizable), two freely positioned/resizable logos,
  scrolling ticker text.
- MP4 recording of the composited output (visual + overlays + audio) via MediaRecorder
  + ffmpeg, with selectable aspect ratios (16:9, 9:16, 1:1, 4:3, 3:4, 21:9).
- App icon (.icns) and dock icon; author Dj LuZa.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

svg/freesvg-music-silhouette.svg

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generator: Adobe Illustrator 19.2.1, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 width="15px" height="15px" viewBox="0 0 15 15" style="enable-background:new 0 0 15 15;" xml:space="preserve">
+<path d="M13.5,1c-0.0804,0.0008-0.1594,0.0214-0.23,0.06L4.5,3.5C4.2239,3.5,4,3.7239,4,4v6.28C3.6971,10.1002,3.3522,10.0037,3,10
+	c-1.1046,0-2,0.8954-2,2s0.8954,2,2,2s2-0.8954,2-2V7.36l8-2.22v3.64c-0.3029-0.1798-0.6478-0.2763-1-0.28c-1.1046,0-2,0.8954-2,2
+	s0.8954,2,2,2s2-0.8954,2-2v-9C14,1.2239,13.7761,1,13.5,1z M13,4.14L5,6.36v-2l8-2.22C13,2.14,13,4.14,13,4.14z"/>
+</svg>