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The version poller already diffs /api/version against the manifest captured at boot -- hot-swapping changed CSS, reloading for changed JS/HTML once playback allows -- but only on its own 60s tick or when the tab regains visibility. Pressing refresh now runs that same check in the background, so a tab left open across a deploy picks the new build up when the user asks for fresh content rather than up to a minute later. App.version.checkNow() exposes it; with no baseline (the endpoint was down at boot) it just adopts the current manifest, since there is nothing to compare against yet. Verified against the running app: appending to style.css and pressing refresh swapped the tag to style.css?v=<hash> with the page still alive, and appending to a .js file reloaded the page. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01QBDkEXP4htyXTCZUwMLphd