Add paid pomodoro breaks

Some jobs pay for breaks, so a pomodoro break shouldn't take time off
the workday. By default (new setting `paid_breaks`, in [reminders]), b
on the Tracker, zb anywhere or :break starts a pomodoro break WITHOUT
pausing the shift: the break stays in your worked time and the data
file isn't touched. b (or s) brings you back to focus. With the setting
off, b pauses the shift like p. p and e always stop the clock.

For the rhythm, a paid break still counts as a break: reminders::PaidBreaks
keeps them in memory and pomodoro() cuts them out of the focus stretches,
the same way as a pause. Stopping the shift ends a paid break, and
closing the work day forgets them.

The Tracker shows "on a paid break" and the paid break's progress, and
the nudges name the right key (b or p/s).

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/ui/keymap.rs

@@ -48,6 +48,7 @@ pub enum Command {
     EndDayAt,
     StartEarlier,
     StartLater,
+    TakeBreak,
     Snooze,
     // Recorded work
     Edit,
@@ -124,6 +125,7 @@ pub const GLOBAL: &[Binding] = &[
     bind("<Tab>", C::NextScreen, "next screen"),
     bind("<S-Tab>", C::PreviousScreen, "previous screen"),
     bind("zz", C::Snooze, "snooze the break reminder"),
+    bind("zb", C::TakeBreak, "take a pomodoro break / back from it"),
     bind("<Space><Space>", C::Toggle, "start / pause"),
     bind("<Space>s", C::StartAt, "start at an earlier time..."),
     bind("<Space>p", C::PauseAt, "pause at an earlier time..."),
@@ -152,6 +154,7 @@ pub const LIST: &[Binding] = &[
 ];
 
 pub const TRACKER: &[Binding] = &[
+    bind("b", C::TakeBreak, "take a pomodoro break / back from it"),
     bind("<CR>", C::Edit, "fix the session in progress"),
     bind("i", C::Edit, "fix the session in progress"),
     bind("o", C::AddAfter, "add forgotten work to today"),