v0.5.8 — WCAG AA accessibility pass and SEO metadata

Accessibility

• WCAG AA pass, 9 violations fixed. Six text inputs (explore city search, login/name search, profile repo search, [owner] repo search and min-stars filter, map top-panel username input) were missing accessible names and now carry explicit aria-label attributes. The min-stars <label> is now programmatically linked via htmlFor/id. The StarNudge popup (role: dialog) gains keyboard dismissal via Escape. The unmapped-stargazers bottom drawer gains role="region", aria-label, and Escape-to-close.
• Dark-mode contrast raised to WCAG AA. text-muted-subtle token in dark mode bumped from #848d97 (4.2:1 ratio) to #8b929a (~4.55:1). Affects secondary labels, breadcrumb separators, and stat hints across all pages.

SEO

• Metadata added to two high-traffic unindexed routes. /trending now has a dedicated layout.tsx with title, description, OG, Twitter card, and canonical. /[owner] (user scan page) has generateMetadata producing a dynamic title {owner}'s repos | StarMapper and a canonical URL.
• OG / Twitter / canonical added to 6 secondary pages. /privacy, /terms, /legal, /changelog, /sponsor, and /organic-score/calibration now carry full social metadata.
• JSON-LD root sanitization aligned. Root layout.tsx now applies .replace(/</g, "\\u003c") on the JSON-LD payload, consistent with the per-repo and profile layouts.

Performance

• Three raw <img> tags in /explore replaced with <Image>. Avatar thumbnails in the Top Contributors, Power Users, and Nearby Developers panels now use Next.js <Image> with loading="lazy", enabling automatic AVIF/WebP delivery.