The value rendered was nogit+<UTC build time>, which carried no
information for the operator, so remove all three display sites
(topbar next to the secure-channel note, setup card, page footer).
Clears the three querySelectors, renderVersion, and the two dead i18n
keys. /api/status is untouched and still returns version - the API is
now the only way to confirm a deploy landed.
The <footer> element is removed with its span rather than left empty:
it had no other child, and an empty footer would still render a
visible separator band (border-top plus 41px padding).
The callback section's field was the only one in the SPA sitting
directly on the panel, with no padded ancestor. It spanned the full
card width with zero side padding and pressed the button bar, while
the copy above it was indented 25px. Wrap it in .field-grid and pad it
to match its card siblings on both desktop and the 720px breakpoint;
.field-wide's grid-column now has a grid ancestor.
Rewrite the callback copy to name the Cloudflare Worker front proxy
explicitly instead of the bare word Worker, and state that registering
a new address retires the previous subscription.