Simple Pomodoro Timer

- Timers now restore accurately after the app is closed or killed.
- Added reliable Android alarms for session transitions and upcoming-session notifications.
- Improved notification and exact-alarm permission prompts.
- Fixed app startup crashes, timer controls, session selection, cycle reordering, progress display, and home layout.
- Duration and cycle edits are now always available; applying an edit stops and resets the timer.
- Improved malformed-data recovery and startup reliability.