Customized keys can execute customized commands

[yorukot]

Is your feature request related to a problem? Please describe.

Currently, superfile’s keybinding system allows users to customize shortcuts for predefined actions, but it does not support executing arbitrary shell commands. This limits flexibility for users who want to integrate external tools or automate common workflows directly within Superfile.

Describe the solution you'd like
We should extend the keybinding system to allow users to map keys to arbitrary shell commands. The implementation would involve:

Adding support for command execution in the configuration file, e.g.:

"ctrl+i" = "rm -rf {file}"
"ctrl+y" = "code {folder}"
"]" = "firefox"
";" = "./someshell.sh"