Add configuration option to disable inline '?' shortcuts menu

[LyalinDotCom]

What would you like to be added?

We need to introduce a user-configurable setting that allows users to disable the "? for shortcuts" help panel (triggered by typing ? at an empty prompt).

Requirements:

• A boolean configuration flag (e.g., display_shortcuts_hint_UI or similar) should be added to the config file.
• Default behavior: true (Enabled).
• When set to false, typing ? should still display the help menu. This is about hiding the UI element, not disabling the actual feature

Why is this needed?

Some user prefer to have a cleaner UI

Additional context

No response

[Student-coder-web]

Hi! I'd like to work on this feature 🙂

I noticed PR #19231 was closed.
Is this issue still open for contribution?
If yes, I can start implementing the config flag to hide the shortcuts hint UI.