docs(blog): add TanStack Start post, author GitHub avatars, and twoslash popover fixes

[yamcodes]

Summary

• TanStack Start Blog Post: Drafted apps/www/content/blog/arkenv-tanstack-start.mdx covering typesafe environment variables across TanStack Start server functions and client routes with Twoslash type inspection.
• Author GitHub Avatars & Links: Added optional authorGithub frontmatter to blog posts, avatar resolution via lib/blog-author.ts, and GitHub avatar domains to next.config.ts.
• Twoslash Popover Formatting:
  • Fixed syntax token vertical stacking caused by display: grid on .fd-twoslash-popover .shiki code. Changed to display: block; white-space: pre-wrap; with grid reserved for :has(> .line).
  • Added cleanHoverDocs in lib/twoslash-options.ts and connected it via rendererRich.processHoverDocs to clean multiline {@link ...} tags and collapse unnecessary single newlines within sentences while preserving markdown paragraphs and lists.
  • Added baseline styling for .twoslash-popup-docs code and paragraphs in base.css and aurora.css.
• Author & Blog Hyperlink Styling:
  • Eliminated 1–2px layout push on author hover caused by theme border-bottom-width shifts.
  • Aligned blog author link and post body hyperlinks with the site footer style (color: var(--color-ink-2), hover to color: var(--color-ink), no underline, zero layout shift).

Test plan

• Run pnpm --filter www test run (53 test files, 218 tests passing)
• Run pnpm --filter www run typecheck (tsc --noEmit clean)
• Run pnpm --filter www run twoslash content/blog/arkenv-tanstack-start.mdx
• Run pnpm biome check on modified files

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Latest commit: 9003903

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[arkenv-bot]

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Project	Deployment	Review	Updated (Asia/Almaty)
arkenv	Ready	Preview, Comment	Sep 5 2026, 5:22 PM (Asia/Almaty)