feat(desktop): brand icons on links to known domains

[OutThisLife]

Links to sites we recognize now lead with the site's brand mark, so a GitHub PR link reads as a GitHub link at a glance instead of another blue chip. PrettyLink covers every markdown link, autolink, and linkified tool output in chat; the artifacts pane uses the same lookup in place of its generic chain glyph.

Hosts resolve by walking the hostname's suffixes, so gist.github.com inherits GitHub's mark without needing its own entry, while a more specific entry like docs.google.com still beats the general google.com one. Unknown hosts render exactly as before — no placeholder, no reserved slot.

The table covers ~170 hosts from Simple Icons, already a dependency here. Slack, LinkedIn, OpenAI, Amazon, and CodePen are deliberately absent: Simple Icons removed them at the owners' request, so those fall through to no glyph rather than a lookalike.

With a mark now carrying the recognition, the chip itself got quieter — links sit in the theme's primary color at body weight, and the tinted fill only appears on hover.

Three details worth flagging for review:

• Glyphs paint in currentColor, not the brand hex. Several brand colors (GitHub's near-black, Unity's white) disappear against one theme or the other.
• title="" on the icon is load-bearing. Simple Icons always renders a <title> defaulting to the brand name, which lands in the anchor's textContent and accessible name — without it a PR link reads "GitHub#123". There's a test on that.
• The font-weight override lives on .link-chip, not the call sites. @tailwindcss/typography sets prose a { font-weight: 500 }, which outranks a utility class on the anchor, so stripping font-semibold from each call site alone did nothing.

Test plan

• tsc -p apps/desktop --noEmit clean
• eslint clean on all touched files
• Full desktop suite green — 3504 passed, 3 skipped
• Resolver contract covered: suffix walk, longest match, www./case normalization, no bare-TLD match
• Render-level: known host emits an <svg>, unknown host emits none, glyph stays out of the link's accessible name
• Checked live over HMR across prose, lists, blockquotes, nested bold/italic, back-to-back links, wrapped long URLs, and unknown-host controls

[github-actions]

૮ >ﻌ< ა ci review

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ℹ️ Info

Desktop E2E visual evidence · View test artifacts · View job

2 visual diffs.

_{inline evidence upload failed.}

Failed to upload diff-3d0b55a29cbf-boot-ready-diff.png with gh image (exit code 1): Error uploading /home/runner/work/_temp/e2e-evidence/diff-3d0b55a29cbf-boot-ready-diff.png: step 0 (get upload token): uploadToken not found on repo page — do you have write access to NousResearch/hermes-agent? (or, if NousResearch enforces SAML SSO, authorize at https://github.com/orgs/NousResearch/sso)