feat: find mail tagged deleted but never moved to trash

Every version before item 103 tagged a message `deleted` and left its file
exactly where it was, so deleted mail accumulated in the inboxes with only a
chip to say otherwise. `Find stranded deleted mail` runs the query that finds
it: tagged `deleted`, and not inside any configured trash folder.

It reports and moves nothing. Acting on its own would be a bulk delete with no
selection behind it, and the user asked for something they could come back to
and review. Repeatable rather than a startup migration, for the same reason:
mail reaches this state again whenever another client tags without moving.

A menu entry only, at the user's request, so it cannot be confused with the
Trash filter beside the other four.

Also adds everyActionIsReachableFromAMenu(), which asserts the fifth
registration site nothing enforced. CLAUDE.md documents four places; a menu is
the fifth, and `restore` shipped on this branch reachable by a chord and by
nothing a user could see. The new test found three more of the same:
open_thread, clear_pane and clear_selection were all keyboard-only. All three
now sit in the View menu.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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