Replace the read-only schedule list with a form-driven builder so users
never hand-edit cron patterns. A canonical ScheduleFormState feeds two
inverse pure functions (toCron / fromCron) that guarantee round-trip
equivalence, so new and edit flows share the exact same UI state shape
even though the DB stores only the pattern. Unrecognised patterns (AI-
generated ranges/steps, descriptors, 6-field seconds cron) fall back
losslessly to an advanced mode instead of being silently rewritten.
The dialog adds live previews (human-readable via cronstrue, next 3
trigger times via cron-parser evaluated in the bot timezone) and row
actions for edit / enable-toggle / delete.
Acbox