feat(fonts): deck-it's text, clock sizes and clock fonts

The Fonts page gets a deck-it section: deck-it's text size (the
override.deckit deck-it already read, with no row until now), and the
dim cover's clock time and date, following it at 8 and 1.6 times unless
given their own size (up to 400px). A Families section names the
clock's fonts, deckit-clock and deckit-date, saved under "family" in
fonts.json; deck-it reads both itself. The name field updates the draft
on every keystroke, since a click on Save takes no focus and an
editingFinished would never come.

The clock font fields leave the deck-it Dashboard page, which wrote
[tablet] keys deck-it no longer reads.

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

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