Loops open in a dialog like New Task, and can run every day at a set time

[pallaoro]

What changes

Loop dialog. Creating and editing a loop now happen in the same popup as the New Task composer, opened over whatever view you are on.

• The sidebar's Loops + used to call a raw setView("loops"), which does nothing while a task is open full-width (the focused task covers every view). It now opens the dialog directly. A never-run loop's sidebar row had the same dead click; it now goes through goToView.
• After a loop is created, the sidebar's Loops section opens so the loop lands somewhere visible.
• Every dismissal (Escape, backdrop, Cancel) discards, like the task composer. The module-scope draft map existed only so the inline form survived a tab switch, which a modal can't have, so it is gone.

Schedule picker. The bare "every N min" field is now a list: every 15/30 min, 1/6/12 hours, Every day at [time], and Custom (minutes).

• "Every day at" is stored as a 5-field cron plus the setter's IANA zone, so a UTC box still fires at their local time. croner (zero-dependency, MIT) computes slots and handles DST. It bundles into the box's cli.js, so boxes install nothing new.
• A missed daily slot runs once on wake, the same rule intervals follow. An edit that sends no schedule keeps the existing one.
• Protocol v13, with FEATURE_MIN_VERSION.loopSchedules. A v12 engine would drop cron on update and keep the old interval while the save looks applied, so the option is disabled for those boxes with a reason.

Bug fix. An interval longer than ~24.8 days fired immediately and then back to back, because setTimeout overflows past 2^31-1 ms. The runner now waits in hops.

Mobile. The phone shows a daily schedule read-only and no longer turns it hourly on save. It does not get the new picker yet.

Testing

• scripts/typecheck.sh clean on the merged tree.
• Server suite: 356 pass, 1 fail. The failure is system:hello handshake, which times out probing agent CLIs and fails identically on untouched main.
• 13 new tests for calendar schedules, DST, slot math, mode switching, the long-timer hop and validation. The early-wake and timer-overflow tests were each checked to fail against the pre-fix code.
• Driven in the dev app over CDP: created a daily 07:30 loop (engine scheduled tomorrow 07:30 Europe/Amsterdam), edited it through 6 hours and Custom 90, and deleted it. The dialog opens over a full-width task from both entry points.

Not verified

• The disabled "Every day at" on an older box: the dev app could not reach boxes while the production app held the SSH forward port.
• The mobile change was not compiled or run (Expo isn't installed in the worktree).