Support for single-key hotkeys in confirmation and selection dialogs

[orgoj]

What do you want to change?

I'd like to propose adding support for single-character hotkeys to the extension selection component.

Why?

I'm using pi inside tmux with tmuxx and need simple way to select Yes and No options.

How? (optional)

• Update the extension API to allow optional hotkey mappings in dialog options.
• Map y/n (case-insensitive) by default to all standard confirmation prompts.
• Update ExtensionSelectorComponent to listen for these keys and show a hint in the UI footer (e.g., y/n next to navigate/select hints).