Consolidate brand mark to one geometry; fix drift from amicode's redesign

[kateebonner]

Summary

logo.tsx's Mark/Splash still rendered the old "digi" pixel-accented robot after amicode redesigned its own mark (amicode PR #99). The comment here promised the two would be "kept in sync manually" (patch #8) — that promise had already silently failed by the time it was checked.

Turns out there were two independent copies of near-identical geometry already living in this repo:

• logo.tsx's Robot (full "digi" variant: fixed #0A0A0A display rect + #FFF676 pixel-pattern glyphs)
• spinner.tsx's AmicoSpinner (a simpler evenodd silhouette, no color accents)

Plus a third copy in the favicon SVG (the "digi" variant again, on a yellow chip background) — a static asset that can't import either.

Fix

• Extracted AmicoSpinner's simpler path as MARK_PATH, exported from logo.tsx. Robot now renders it directly; AmicoSpinner imports it instead of carrying its own literal.
• Favicon updated to the same simple path (kept as a literal + a comment pointing at MARK_PATH, since a static SVG can't import a TS module).
• Chose the simple silhouette over porting in amicode's new detailed mark: Mark/Splash render from 12px (enterprise share page) up to 144px (session-new-design-view) across this codebase. Per amicode PR fix(chat): pending shell row stops impersonating an error; chips survive a shell-driven session #99's own findings, fine pixel detail only resolves above ~64px — using the new detailed mark at the small end would reintroduce the exact legibility problem amicode flagged as a known limitation in its own tab icon.
• This does not re-establish a cross-repo sync promise — MARK_PATH is now the single source of truth within this repo, independent of whatever amicode's mark does next.

Full details, including the exact verification greps, in AMICODE-PATCHES.md entry #15.

Test plan

• bun test src (packages/ui) — 95 pass, 0 fail (unchanged — no test asserted the old geometry)
• bun turbo typecheck — full 23-package monorepo typecheck green (ran automatically via pre-push hook)
• bun run --cwd packages/app build — verified via grep that dist/assets/home-*.js and dist/assets/index-*.js both contain the unified path; zero hits for the old #0A0A0A marker anywhere in dist/assets
• Live vite preview serve: GET / → 200 <title>Amicode</title>; GET /amico.svg → 200
• Full native bun run script/build.ts compile + vendored-binary swap + dev-host acceptance on port 43117 — deferred to whoever cuts the next amicode.N release tag (same split as patch Fix chat scroll jitter during streaming; respect reduced motion #11's release-prep), since this patch only rebuilds the embedded web UI, not the binary

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Update: Meet Amico card uses the detailed mark

Added MarkDetailed (packages/ui/src/components/logo.tsx) — the richer circuit-pattern H-robot from amicode's PR #99 redesign, wired to currentColor/var(--icon-strong-base) so it stays theme-adaptive in this live webview (unlike amicode's VS Code tab icon, which needed separate light/dark files since a native tab icon has no live CSS context).

Scoped to just the Meet Amico card (home-cards.tsx, w-12 / 48px) — every other Mark/Splash call site stays on the simple silhouette (MARK_PATH) per the legibility findings above (12-40px range, below where the detailed mark's pattern resolves).

Re-verified: bun turbo typecheck (full 23-package monorepo, via pre-push hook) green; bun test src (ui) 95/95 pass; rebuilt packages/app and confirmed via grep that the detailed mark's path landed in the built bundle (hoisted to the shared main chunk, same as AmicoSpinner's precedent) while the simple MARK_PATH remains for every other call site.