fix: improve public detail keyboard access and reflow

docs/ACCESSIBILITY.md

@@ -29,3 +29,44 @@ Run automated accessibility testing in CI.
 Serious accessibility regressions should fail CI.
 
 Automated tests do not replace manual keyboard and assistive-technology review for important workflows.
+
+## Public browsing review — 2026-09-10
+
+Scope: catalog filters and listing links, listing/product detail states, image
+selection, condition display, and seller contact links. Fixtures use public DTO
+shapes, including `url`/`altText`, ten images, and a long seller email.
+
+Findings fixed:
+
+- Gallery buttons now use API `altText`, with legacy `alt` and label fallbacks,
+  rather than announcing “undefined”. Controls form a named group and wrap.
+- Failed API `url` images now announce an unavailable image rather than claiming
+  no image exists.
+- Detail text and grid children reflow without forcing horizontal scrolling;
+  long seller contact addresses remain readable and focusable.
+- Read-only detail conditions are text, removing a button that had no action.
+- Listing and product loading/error messages expose status/alert roles.
+
+Browser review: Codex in-app browser, keyboard and accessibility-tree inspection,
+with screenshots checked at a 320px viewport. Tab/Enter select gallery images,
+selection remains indicated, Tab reaches email then phone without a condition
+button detour, and focus outlines remain visible. The populated catalog's filter
+disclosure opens via Enter; expanded filters and the listing card fit at 320px.
+Contact targets were inspected without launching email or telephone applications.
+
+Enlargement review: 640px viewport (the CSS layout width of a 1280px browser at
+200% zoom), additionally with root text enlarged to 200%. Detail text, gallery
+controls, and seller links remain readable and keyboard-accessible without
+horizontal scrolling. This is reflow/text-resize coverage, not a native browser
+zoom result: browser-zoom shortcuts were unavailable in the review browser.
+
+Regression coverage: mobile catalog filter keyboard interaction and listing
+focus/link target; gallery selection and contact focus order; narrow and enlarged
+reflow assertions; read-only condition story; broken API image fallback; and
+loading/not-found announcements on both public detail pages. Existing light/dark,
+empty-image, sold, and pending stories remain part of the accessibility gate.
+
+Remaining manual coverage: native browser zoom, screen-reader speech and route
+announcements (VoiceOver/Safari or NVDA/Firefox), and the full live-data navigation
+journey. Automated checks and accessibility-tree inspection do not certify WCAG
+conformance or replace those reviews.