* skeleton
* make `Event` widget work

Reverts #112.

For targeting a date (past/future) a new `event` feature will be
introduced (soon).

* trait ClockDuration, CalendarDuration, tests

* make clock rendering more generic

* remove `should_blink` from `RenderClockState`

* pass less down: `mode` -> `editable_time`

* simplify `event` duration states

* remove deprecated `DirectedDuration`

* fix comments

using `get_percentage_done`

Similar to `Countdown` and `Pomodoro` DONE effects.

* feat(cli) parse `event`

* check possible `Event` for `mode`

* m.bros

* feat(screens) switch by `←` or `→` keys

* test cycling `Content` using `next`/`prev`

* update CL

* feat(event) persist state

* `Event::default()`

* wip: editable events

* make it work

* fix: scroll position, title validation, underline

inputs to visualize edit mode

* show error

* prefix datetime

* refactor rendering inputs

* compact `EditMode`

* update footer to include `event` keybindings

* update README

* demo: event

* update README

* update CL

* fix(event) relax validation

to show errors if needed only, but not all the time

* update demo

* update CL

* fix demo

* `prepare|switch_input`

* add `AGENTS.md`
* update README