Inbox has no working delete action, but the entry was hidden entirely, so users
had no way to learn why. Show the disabled entry in both the row actions menu
and the context menu with an always-visible inline explanation instead of a
native title: disabled context-menu items are pointer-events-none and are
skipped by keyboard focus, so a title tooltip is unreachable.
Clicks on the disabled entry no longer bubble to the notebook row, which used
to switch the selection to Inbox. The wording also clarifies that restored
notes land in Inbox when their original notebook was deleted, not always.
Fixes#503
X77
c647f6b624