v0.3.0 – product gallery, structured data, real photography

Added

• Product gallery interactions: hover zoom, a full-size lightbox, and
  slide transitions between images.
• Structured data for search engines: product pages emit
  schema.org/Product (with price, availability, and ratings) and
  portfolio pages emit schema.org/CreativeWork.
• Product pages now always have a meta description — when there's no
  excerpt, one is derived from the product's description.

Changed

• The sitemap now covers every content type. Pages were missing
  entirely, and every product URL in the sitemap pointed at a route
  that didn't exist. Sites created from an earlier seed need a
  one-time schema update (seeds don't re-apply to existing
  databases): give each collection the URL pattern and SEO flag it has
  in seed/seed.json, via the admin's content-type settings or the
  schema API.
• Page titles use one separator everywhere (a compact | by default),
  and it's now editable under Settings → SEO in the admin.
• Demo imagery is now real photography (CC0/CC BY, credited in
  CREDITS.md) instead of placeholder artwork, with AVIF/WebP
  variants for the heavy images. Shop products each get distinct
  photos — several previously shared one. README and screenshots
  refreshed to match.

Fixed

• The demo post "Throught the lens" is now "Through the lens" — title,
  URL, and every link to it. Existing databases need the same rename
  applied to their content.
• Product gallery glitches: a slide getting stuck when revisiting an
  image, plus zoom, keyboard, and lightbox-focus issues.
• Several homepage links pointed at posts that don't exist in this
  seed.
• Long unbroken words or URLs in blockquotes could overflow the screen
  on narrow viewports.
• Injected content (embeds, ads, third-party widgets) pasted into
  posts/pages could carry fixed, oversized dimensions with no theme
  sizing constraint. Added a generic max-width: 100% +
  overflow: hidden guard on iframe/embed/object inside content
  areas — no ad-network-specific selectors, so it holds regardless of
  provider. Documented the existing html, body { overflow-x: clip }
  rule as an intentional last-resort backstop for the same class of
  bug.