allow keyboard navigation of table actions and links

we have the arrow keys to move around a table.
would be nice if you could trigger table actions, double click and context menu with keyboard as well.
ditto for opening any auto-linked URLs.

some modifier with enter key?

once the context menu is open you should be able to use arrow keys and enter.

Start by locating the existing table arrow-key navigation entry point and the handlers for table actions, double-clicks, context menus, and auto-linked URLs. Clarify the intended modifier and focus behavior, then verify that keyboard users can trigger each action, navigate an opened context menu with arrow keys, and activate an item with Enter.

Written by the indexing model from the issue text.