Better way to register keybindings and display them dynamically

Functionality to register keybinding in the code and render the keybindings help page dynamically based on that to avoid inconsistencies between the keybindings shown in `keybindingsModal.html` and the actual keybindings (e.g. if we change them or add new ones).

Start by locating the current keybinding definitions and reading keybindingsModal.html to understand how the help page is populated. Trace where bindings are registered and displayed, then verify that adding or changing a binding updates the help page without a separate manual list. Done means the displayed keybindings remain consistent with the actual registered bindings.

Written by the indexing model from the issue text.