New

• dashboard: simplify domain detail page with collapsible DNS records #63
• api: add machine-readable error codes, rate limit headers, and documentation links #59
• dx: add DNS auto-retry timer and sandbox mode for unverified domains #60
• dashboard: add getting started onboarding checklist to overview #58
• dashboard: improve accessibility and WCAG compliance #57
• dashboard: add send test email button on domain detail page #56
• dashboard: add domain detail page with list-to-detail navigation #55
• dashboard: improve DNS verification UX with cleaner messages and auto-check on domain add
• dashboard: show smart DNS merge suggestions for existing records
• dashboard: animated domain add UX and real DNS verification

Fixed

• dashboard: use idiomatic range contains in format_date filter
• ci: migrate all jobs to self-hosted runner #61
• dashboard: apply rustfmt to send test email handler
• dashboard: apply rustfmt to domain delete handler
• common: use tokens.contains() instead of iter().any() per clippy
• dashboard: register admin templates in include_str loader
• common: apply cargo fmt to dns merge suggestion functions
• dashboard: register new domain templates in include_str loader
• landing: add HSTS header, canonical URL, og:image, RSS autodiscovery, and deduplicate footer CSS