wiki: add Carbon Design System icons (2673) + pictograms (1000)

- 2673 SVG icons from @carbon/icons v11.82.0 (~2.5 MB)
- 1000 SVG pictograms from Carbon Design System (~2.0 MB)
- Updated 00-overview.md with asset structure and category listing

All icons: 32x32, fill: currentColor, optimized SVG
All pictograms: 24x24, fill: currentColor, SVG

assets/icons/carbon/fade.svg

@@ -0,0 +1 @@
+<svg id="icon" viewBox="0 0 32 32"><title>fade</title><path d="M8.24,25.14,7,26.67a13.79,13.79,0,0,0,4.18,2.44l.69-1.87A12,12,0,0,1,8.24,25.14Z"/><path d="M4.19,18l-2,.41A14.09,14.09,0,0,0,3.86,23L5.59,22A12.44,12.44,0,0,1,4.19,18Z"/><path d="M11.82,4.76l-.69-1.87A13.79,13.79,0,0,0,7,5.33L8.24,6.86A12,12,0,0,1,11.82,4.76Z"/><path d="M5.59,10,3.86,9a14.37,14.37,0,0,0-1.64,4.59l2,.34A12.05,12.05,0,0,1,5.59,10Z"/><path d="M16,2V4a12,12,0,0,1,0,24v2A14,14,0,0,0,16,2Z"/></svg>