Add session-owned Pomodoro cycles and controls

Add configurable work and break intervals, pause/resume, CLI and activity-popup controls, and silent completion alerts. Use CLOCK_BOOTTIME deadlines so running timers include suspend without consuming paused time.

Refs #31

compositor/src/state/reconciliation.rs

@@ -168,7 +168,7 @@ impl Ferese {
         self.desktop_transition.as_mut().unwrap().publishing = true;
         let activity_output = self.space.outputs().next().map(|output| output.name());
         if let Some(output) = activity_output
-            && self.activities.store.attach_output(&output)
+            && (self.activities.store.attach_output(&output) | self.activities.pomodoro_attach_output(&output))
         {
             self.activities.changed();
         }