Mail · Sorting: a label picker and a snooze menu

LabelPicker puts labels on a message: a field finds them by name,
arrows move and a press or Enter turns one on or off, each row with its
check and its hue. A name no label has can be made into one, and the
field starts over. Its rows are the option rows every list shares;
forms::marked_row leads one with a mark. The cursor shows only while
the field has focus.

SnoozePicker offers later today, tomorrow, this weekend and next week,
each with its day and hour, or a time picked in a dialog. It shares
mail::times with ScheduleSend: the names, the dialog, which now waits
for a time ahead of now, and a rule that a moment comes once, so on a
Sunday tomorrow morning no longer repeats as Monday morning.

tasks/ch21-30.md

@@ -382,8 +382,8 @@
 
 ## T29d Mail · Sorting
 
-- [ ] LabelPicker
-- [ ] SnoozePicker
+- [x] LabelPicker
+- [x] SnoozePicker
 
 ## T30 Calendar — `src/calendar`