Push an in-app history entry on each page switch (page rides in history.state, URL stays
clean — filters still never go in the URL) and sync the page from history.state on
popstate. The initial entry is stamped after the strip-params effect (which nulls
history.state). Now the mouse/browser Back button steps through visited pages instead of
jumping straight to the Google consent/redirect. Second step of Epic N.
peter
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