feat: command history

[fdcote]

This PR introduces command history.

Navigation: Pressing the up and down arrow keys (customizable) in command mode cycles through previous commands.

Persistence: History is automatically saved across sessions.

Filtering: Typing the initial characters of a command filters the history for faster recall.

With filtering, this update also appears to resolve issue #63.

[freref]

This works great, thanks. Will make an issue to add ghost text in the future and I'm wondering if we should store it at ~/.fancy-cat_history, following the convention of other projects.

[fdcote]

Ghost text would be neat!

Regarding the location of the history file, maybe we could base it on a flexible XDG approach for config and state files:

1. Check to use the XDG locations if the relevant environment variables are set.
2. If the variables are not set, use the standard fallback locations.
3. Legacy locations are only used if a config file already exists there and no file exists in either the XDG or fallback locations.

	XDG	Fallback	Legacy
Config	$XDG_CONFIG_HOME/fancy-cat/config	~/.config/fancy-cat/config	~/.fancy-cat
History	$XDG_STATE_HOME/fancy-cat/history	~/.local/state/fancy-cat/history	~/.fancy-cat_history

[freref]

Sounds good. You want to add that to this PR or as a future issue?

[fdcote]

Perfect. I can add it to this PR in a little while.

[fdcote]

I’ve included the logic for both the config and history file locations in this PR, as mentioned above.