Ten more interactive camera families: bubbles, balloons, particle mirror, cloth, light painting, touch fluid, electric silhouette, swarm, tile wall, firewall

interactive.js becomes a multi-mode engine sharing camera, motion grid,
gradient/centroid tracking and the mouse fallback. New renderers: point/line
sprites (mirror/swarm/cloth/pops) and a ping-pong trail FBO (painting).
fluid.js gains a 'touch' emitter mode fed by motion splats from the camera.
Mirror mode reforms the custom SVG/image if loaded, else a DJ LUZA wordmark.
UNPACK_ALIGNMENT set to 1 for non-multiple-of-4 single-channel uploads.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/visualizer.js

@@ -90,6 +90,9 @@ class Visualizer {
     gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
     gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, source);
     gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, false);
+    // Also kept for the interactive "mirror" mode, whose particles reform
+    // the custom image instead of the default wordmark.
+    this.customSource = source;
   }
 
   render(timeSec, audio) {
@@ -98,6 +101,7 @@ class Visualizer {
     if (this.inter && !e.isInteractive) this.inter.suspend();
     if (e.isInteractive && window.InteractiveSim) {
       if (!this.inter) this.inter = new window.InteractiveSim(gl);
+      this.inter.customSource = this.customSource || null;
       this.inter.render(timeSec, audio, e, this.canvas);
       return;
     }