- Extract local state of `app_time_format` from `footer` to have it globally available
- Add a deserialization fallback for deprecated `AppTimeFormat::Hidden`
- Persist `footer_app_time` toggle state
- While editing, an user can apply changes as a new initial value (pomodoro/countdown only).
- New keybinding: `[^s]save initial value`
- Update keybinding: `[s]ave changes` (instead of `[Enter]`)
- Refactor event handling to re-structure `edit` / `non-edit` modes.
- Refactor footer to reflect latest keybindings
* (pomodoro) reset both clocks at once
* quit app by pressing `q` only
* (countdown) enter/esc keybindings
* (timer) enter/esc keybindings
* (pomodoro) enter/esc keybindings
* update footer label
* fix(coundown): don't reset elapsed clock
while skipping editing changes
* fix(clock): order of actions matters for ESC
handling. Set `pause` instead of `initial` mode while toggeling back.
* fix(timer): order of actions matters (ESC key)
* (footer) update order, lowercase standard keys
