Closes #34698

The buffer search query input is itself an editor, so dispatching
`editor::ToggleSoftWrap` from the command palette while the search bar
had focus toggled soft wrap on the single-line query editor (with no
visible effect) and never reached the searched editor.

This intercepts the action on the search bar in the capture phase and
applies it to the active searchable item, the same way `ToggleFoldAll`
is already relayed. Focus stays in the search bar, so you can keep
typing your query. `Editor::toggle_soft_wrap` and
`Editor::soft_wrap_mode` become `pub` (matching
`fold_all`/`has_any_buffer_folded`, which the existing `ToggleFoldAll`
relay already uses).

Includes a regression test that fails without the fix: it deploys the
search bar, dispatches `ToggleSoftWrap` with the query editor focused,
and asserts the searched editor's wrap mode changes while focus remains
in the search bar.

Release Notes:

- Fixed `editor: toggle soft wrap` doing nothing when invoked while the
buffer search bar was focused

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Co-authored-by: Christopher Biscardi <chris@christopherbiscardi.com>