[ShuminFu]

What does this PR do?

Replaces the dense-roots ff monogram from #15 with the approved direction B mark: the same ff, two-leaf sprout, and short U, with only a few gently curved hyphae under the U, each ending in a filled node.

The attached reference (logo-dir-b.png / logo-dir-b.jpg) was the user-approved pick. The glyph is that silhouette. No wordmark in the SVG.

• Logo.astro keeps the class prop, fill="currentColor", and aria-hidden="true", with a tight viewBox.
• favicon.svg uses the same paths with the sage fill #849B6F.
• favicon-32.png and apple-touch-icon.png were regenerated from that SVG. Nothing else in public/ is a site-mark favicon (public/icons/ is memory-point art and is unchanged).

Left open for a human merge.

How to test

1. npm run dev
2. Check the header mark at ~24px in light and dark, and on a second color theme.
3. Confirm /favicon.svg, /favicon-32.png, and /apple-touch-icon.png show the sparse nodes, not the dense roots.

Checklist

• npm run build passes
• Tested in light and dark mode
• Tested with at least two themes (classic, sage, and anthropic)
• No new warnings in the console

Header mark at 24px

Light header

Dark header

Apple touch icon

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