OGP & infographics shipped; SEO fixes

Quick summary

• Big chunk of work landed across the three deariary repos: blog, frontend, and LP.
• Ship highlights: per-article OGP images, a Gemini-based infographic generator, onboarding and docs links in the app, and several sitemap/hreflang/SEO fixes.
• Also added the founding blog post and a content-ideas doc to seed future posts.

Blog / content

• Published the founding story post "The diary I couldn't keep" and checked in a long content-ideas doc (90+ ideas) as a task list for future posts.
• Added a CLI infographic generator using Gemini (Nanobanana) that reads a markdown post and emits a layout-aware summary image.
  • Tool usage: npm run infographic -- src/content/blog/<post>.md [--size 1080x1350]
  • The generator outputs to dist/infographics/ by default (gitignored). I also changed output to commit some generated images into public/infographics/ for the two existing posts.
• Built per-article OGP image generation at build time using satori + @resvg/resvg-js so each post now has a unique 1200×630 share card that matches the frontend design.
• Key PRs:
  • OGP images: feat: generate per-article OGP images at build time
  • Infographic generator: feat: add Gemini Nanobanana infographic generator for SNS posting
  • Content + ideas: PR adding the founding post and ideas doc.

Frontend & onboarding

• Reduced onboarding flow from three steps to two (Setup → Format) and added a persistent next-action banner so users can get to the app faster.
• Added Public API docs links across app surfaces (Settings > API Keys, upgrade prompts, billing rows) so users can find docs from multiple places.
• Added an install prompt / direct GitHub App install link for private repository access in the GitHub integration settings.
• A bunch of small fixes and snapshot updates (localization tweak for private repo prompt, footer link label alignment, tests).

LP / SEO & social

• Sitemap + hreflang work:
  • Added <xhtml:link rel="alternate" hreflang="..."> entries to sitemap URLs so Google can pick up hreflang signals from XML as well as HTML.
  • Fixed a hreflang mismatch on the API page (now restricts alternates to en + x-default when non-English locales redirect to /en/api) and added noindex to 404/error pages.
  • (See PR: add hreflang alternates to sitemap)
• Footer: added X (Twitter) and Bluesky social links, with a SocialIcon component, aria labels, and outbound analytics tracking.

Repo / org housekeeping

• Bumped versions: blog → 0.1.0, frontend → 0.2.1 (minor 0.2.0 earlier), lp → 0.2.2.
• Updated snapshots / tests in several places after the UI changes.
• Org README and a small cleanup landed in the .github repo (removed a personal sample diary URL, added public org profile README).
• Repo metrics still small (each repo has 1 star, frontend shows 46 open issues, lp 2 open issues). Total today: 20 commits, 9 PRs merged.

Next things to track

• Make sure the generated OGP images and committed infographics are correctly served from public/infographics/ and are picked up by social scrapers.
• Monitor onboarding completion after the two-step change and the visibility of the new Public API links in user flows.
• Validate sitemap hreflang signals in Search Console after the XML changes.