Dailiness is guessed from the source's wording, which is a weak signal
and wrong in both directions. Guessing on a reader's behalf and hoping
they notice is the wrong default for a checklist they may build a streak
on, so `detectDaily` now starts false and the control carries an
Experimental tag saying what it does and doesn't know.
The default applies to new readers only — a stored `prefs` keeps its
value, because switching it off under someone who has been ticking
auto-detected checklists would pull those chips out of the strip with no
explanation. Nothing is deleted either way.
Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
