feat: preserve focus and catalog context during public navigation

docs/ACCESSIBILITY.md

@@ -70,3 +70,22 @@ 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.
+
+## Public route navigation — 2026-09-10
+
+- Catalog cards use router links with ordinary URL/open-in-new-tab behavior.
+- Catalog and public detail pages set descriptive browser titles. Detail titles
+  update to the product name or error message after loading.
+- Entry focuses the named main landmark with a visible keyboard outline. It is
+  programmatically focusable (`tabindex=-1`) without adding an extra Tab stop.
+  Query updates and asynchronous results do not move focus again.
+- Filtered catalog links carry their origin in `from`; “Back to catalog” restores
+  that URL. Only `/` and catalog query URLs are accepted; external or non-catalog
+  destinations fall back to `/`. Browser Back retains its normal history behavior.
+- Three public Playwright tests exercise keyboard navigation, query preservation,
+  browser Back, direct product links, not-found titles, safe return URLs, and a
+  delayed response while focus remains on the return link. They intercept public
+  API responses and do not require credentials or mutate production data.
+
+These checks verify browser focus, titles, and navigation behavior. Screen-reader
+speech and native browser zoom remain manual follow-ups from the earlier review.