TudorandClaude Opus 5
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The staging E2E gate has been red since #132 merged (run 1064, and 1066 after it): "a school reached from a location page is attributed to it, not to direct" expects `place`, receives `direct`. #132 fixed a real bug — `/schools/` had no case and fell through to `direct` — but the mechanism underneath it never worked. getNavigationSource read document.referrer, which the browser writes only when a *document* loads. Every internal navigation here is an App Router soft navigation: history.pushState, no new document, so document.referrer goes on naming whatever opened the tab for the whole session. Verified on staging: load /schools/brentwood, click a school, the URL becomes /school/… and document.referrer is still "". So `from` reported `direct` for essentially every in-app journey, not just the ones through the location layer — search, rankings, compare and detail were all being counted as "typed the URL". The unit suite passed throughout because every case set document.referrer directly, which only happens on a full page load. The fix is a module-level trail written by RouteTrail, a render-nothing client component in the root layout. Its lifetime is exactly right: it survives soft navigation, and it dies on a real document load — which is precisely when document.referrer becomes meaningful again, so the two cover each other with no overlap. Reading it skips entries equal to the current path rather than taking the second-to-last. That makes the answer independent of whether the layout effect or the page effect ran first — React orders those by tree position, which is not a contract worth resting a measurement on — and it gives the right answer both when the user returns to a page they came from and on a hard load of a school page. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FuPUioHpxtaiDNagQvjxyM