[Feature]: Show a compact view of all keyboard shortcuts in an overlay as long as key [?] is held pressed

[oleschri]

Description

Other tools support having a quick lookup of their keyboard shortcuts via pressing the [?] key, some toggling the view, some as long as holding the key.

Hoverzoom seems to prefer holding the key pressed to show things.

See also:
Gmail - Open keyboard shortcut help
Outlook Online - Open keyboard shortcut help

Additional context

No response