1. Build-ID cache busting (server.js):
- Compute a BUILD_ID at boot: git HEAD short hash if available,
else /app/BUILD_ID file, else random-on-boot.
- On first request for /, rewrite every local /js/*.js and
/css/*.css reference in index.html to include ?v=BUILD_ID.
Cached once at startup so subsequent renders are free.
- X-Build-Id response header + GET /api/build expose it for
debugging.
- Eliminates the "works after hard-refresh" class of bugs: every
deploy gets a new build ID, so browsers fetch fresh JS/CSS on
the very next page load.
2. Optimistic encounter locking wired into the client
(public/js/encounters.js):
- On resumeEncounter(): stash enc.version into
window._encounterVersions[id]
- On saveEncounter(): send expected_version in the POST body
when we have one.
- Server returns 409 if another tab/device wrote first → user
sees "Someone else edited this encounter. Reload to see the
latest version." instead of silently clobbering the prior save.
- On success, remember the new server-assigned version for the
next save.
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