chore(rstack): add SVG logo variants - #91

SVG post-export cleanup

After exporting the artwork from Figma, I applied the following cleanup to each SVG:

• Kept the files standalone: retained the root xmlns and viewBox, and omitted fixed root width/height values so consumers can size the icons.
• Preserved rendering semantics: kept all path geometry, fills, strokes, opacity, gradients, clip paths, transforms, overflow behavior, and the nested preserveAspectRatio values required to reproduce the Figma placement.
• Preserved the intended variants: avatar and website assets retain their category-specific backgrounds, while simplified assets use a transparent background.
• Removed Figma-only layer information: deleted 2,091 unreferenced layer id attributes. This reduced the SVG set by 30,573 bytes without changing path data.
• Kept and namespaced functional definitions: retained the 65 IDs referenced by gradients or clip paths, renamed them with variant/product prefixes, and updated every reference. All IDs are globally unique, so multiple icons can be safely inlined in one document.
• Excluded non-standalone content: verified that the files contain no external Figma URLs, data:image payloads, raster <image> elements, scripts, style blocks, titles, descriptions, or metadata nodes.
• Avoided risky optimization: did not reduce path precision, merge paths, flatten transforms, or remove structural groups when doing so could change the artwork.

Validation performed:

• all 24 SVGs pass xmllint;
• all 65 functional references resolve to definitions;
• no duplicate functional IDs remain across files;
• 256×256 rasterized renders before and after the metadata/ID cleanup are byte-identical.

after optimization