Allow distinguishing left and right Alt keys in keybindings

[patrikkaprinay]

Add an optional configuration that lets users bind shortcuts to a specific Alt key (left or right). For example, assigning left-alt + 1 would only trigger when the left Alt key is used, while right-alt + 1 could be treated as a separate combination.

This change should remain fully backward compatible - existing bindings like alt + 1 would continue to work with either Alt key unless explicitly specified otherwise. The feature would provide more flexibility without affecting current configurations.

[jamescrake-merani]

This would be quite useful for me as well.

I'm on a UK keyboard so if I want to type the hash symbol, I would normally have to type alt + 3. Yet on Aerospace's default config, this will move to the third workspace. Ideally, I'd like to free up one of these alt keys for this purpose.

[jimmyroot]

I'd appreciate this feature too, I have the same issue with the hash key (alt + 3) on a UK layout.