fix(brand): one official mark, with the sun touching all four edges

[GeiserX]

The sun sat in a 192×192 box inside a 256 canvas — 32px of padding left and right, 36 top — so the mark read as something small floating in space wherever it was placed.

Measured rather than eyeballed. Rendering and trimming gave 192x192 at +32+36; it now gives 256x256 at +0+0 — touching, never overflowing.

Scaled about the disc's own centre (r 96 → 128, and up 4px because the sun sat at cy=132) rather than re-deriving every band and the plane by hand, so the artwork is exactly as drawn.

One mark everywhere

There were three different drawings before: logo.svg (transparent, r=96), icon.svg + images/icon.svg (a dark rounded plate with an even smaller r=72 sun), and a hand-tuned 32px favicon (r=11). All four files are now byte-identical.

Two things I got wrong, both caught by rendering rather than reading

• I had claimed logo.svg carried a white background and rejected it for the Heimdall tile on that basis. It does not — that white rect is inside a <mask>, so it is never painted. Its top-left pixel is srgba(0,0,0,0), mean alpha 0.35. That rejection was wrong; the Heimdall submission is corrected separately.
• My first favicon attempt scaled its artwork the same way. Also wrong: the bands and plane were hand-sized for 32px, so enlarging the disc made the plane dominate and break out of the circle. Rendered at a real 32px the canonical mark beats both it and the original, so the separate drawing is retired.

Verified: all four parse as XML, all four measure full-bleed at their own size, mkdocs --strict builds, 4370 tests pass.

[coderabbitai]

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