Public profiles, onboarding, and API docs

Public profiles & sharing

• Shipped the new public profile route at /u/:username that lists shared entries pulled from GET /@:username — merged as feat: add public profile page for shared entries.
• Follow-ups: aligned layout with the shared page container, standardized entry cards, fixed hover/metadata, and kept shared entry links on the current frontend host.
• Added numbered pagination, stabilized analytics + i18n, and filled in list title translations.
• Built sharing polish: a dedicated share card before the CTA, SNS share buttons, and server-side caching with revalidation for public pages.

Onboarding & integrations

• Redesigned the integration setup step: integration cards with search, a minimal toggle/search mode, clearer selection states, and visual tweaks to keep cards “active.”
• Prioritized Bluesky in onboarding recommendations and aligned the step with the existing flow; cleaned up regressions (issues 407–411).
• Removed the manual email input from registration and tightened handoff/locale handling in registration.
• Added selection guidance (and wording fixes) for Slack/GitHub settings, plus a success toast after saving integration config — small but nice feedback loop.

Localization & i18n

• Completed and normalized all locale dictionaries with full key parity (no English fallbacks left) — merged as feat: complete global locale dictionaries.
• Fixed a bunch of locale copy issues: diacritics, punctuation, corrupted strings; updated mocks/snapshots and test coverage for the expanded dictionaries.

LP / Public API docs

• Wrote and shipped the localized Public API overview page at /[locale]/api — merged as feat(lp): add public API overview page.
• Pulled API copy into locale dictionaries (limited to en/ja), made the public API page content English-only where appropriate, and aligned layout with legal pages.
• Expanded docs with request/response examples, clarified webhook behavior, added an incoming webhook section, and cleaned out the private API key bits.
• Redirected non-en API routes to en, updated sitemap/locale snapshots, and synced field docs with server responses.

Tests, fixes, odds & ends

• Added tests/coverage for public profile + share card; updated snapshot expectations across components and integration pages.
• Fixed footer links and nested list markers; aligned LP/app routes and localized legal links for the ja footer.
• External: merged Dependabot bumps (rubocop-ast 1.49.1) across a few org repos — quiet housekeeping.