fix(asset): make Codex icon render solid + cutout under template tint
The two-path Codex SVG painted as a hollow flower with the `>_` glyph
filled in the middle when SwiftUI flattens it for template rendering
(both paths take currentColor; evenodd on the flower turns it into a
ring instead of a solid mark).
Merge the glyph sub-paths into the flower path and drop the
`m0 1.328` inner sub-ring so a single `fill-rule="evenodd"` path
gives a solid flower with the `>_` punched out as native cutouts —
matching what LobeHub's React component achieves via two-colour fill.