A deploy shouldn't refresh the page out from under you

The app is inlined in the page, so when a new service worker took
control the page reloaded — otherwise it would keep running the old
build. But navigations are network-first: the refresh that triggered
the update had already fetched the new page, so the reload landed a
second or two later as an unasked-for second refresh.

The page and the worker now carry the same build token and the page
asks which build took over, reloading only on a real mismatch. The
token is hashed before substitution, since a page cannot contain a
hash of itself.

tools/sw-reload-test.js pins all three cases against a swappable
server: a first visit doesn't reload itself, a refresh after a deploy
is the only refresh, and a page left sitting open across a deploy is
still reloaded — exactly once. The previous build takes two loads for
one manual refresh; this one takes one.

Co-Authored-By: Claude Opus 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Wvj4aoeMZwA7VUGdJP9Swi

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