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/thumbnail-preview.svg

@@ -0,0 +1 @@
+<svg id="icon" width="32" height="32" viewBox="0 0 32 32"><title>thumbnail-preview</title><path d="M28,12H4a2.0023,2.0023,0,0,0-2,2V28a2.002,2.002,0,0,0,2,2H28a2.0023,2.0023,0,0,0,2-2V14A2.0027,2.0027,0,0,0,28,12ZM20,28H12V27a1.0009,1.0009,0,0,1,1-1h6a1.0009,1.0009,0,0,1,1,1Zm8,0H22V27a3.0033,3.0033,0,0,0-3-3H13a3.0033,3.0033,0,0,0-3,3v1H4V14H28.002Z"/><path d="M16,23a4,4,0,1,1,4-4A4.0042,4.0042,0,0,1,16,23Zm0-6a2,2,0,1,0,2,2A2.0023,2.0023,0,0,0,16,17Z"/><path d="M30,4V8a2.0027,2.0027,0,0,1-2,2H24a2.0027,2.0027,0,0,1-2-2V4a2.0027,2.0027,0,0,1,2-2h4A2.0027,2.0027,0,0,1,30,4ZM28,8l.002-4H24V8Z"/><path d="M20,4V8a2.0027,2.0027,0,0,1-2,2H14a2.0023,2.0023,0,0,1-2-2V4a2.0023,2.0023,0,0,1,2-2h4A2.0027,2.0027,0,0,1,20,4ZM18,8l.002-4H14V8Z"/><path d="M10,4V8a2.0023,2.0023,0,0,1-2,2H4A2.0023,2.0023,0,0,1,2,8V4A2.0023,2.0023,0,0,1,4,2H8A2.0023,2.0023,0,0,1,10,4ZM8,8l.0015-4H4V8Z"/></svg>