wallpaper engine: count down to the next change

The header gave the clock time of the next change, which left the sum to
the reader. It now counts down, from a one second timer that lives on the
page, so nothing ticks while the page is closed. The engine still keeps
only nextAt.

The function is remaining(), not left(): left is Item's anchor line, so
the call threw a TypeError and the status text went blank, which a clean
hot reload does not show until the page is opened.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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