* refactor(shared): move the pane title sanitizer to shared, unchanged
So main's layout Loader can apply the same rule the window applies on load.
* fix(layout): pane titles stay layout in a layout-owner build (dark)
The window stops writing a revealed terminal's tab name as its pane title,
and main's Loader drops a lone pane title that only repeats the tab's name,
as the window's load does. Both behind ORCA_LAYOUT_OWNER_IS_MAIN.
* fix(layout): the Loader compares a lone pane title with the tab bar's quick command label too (dark)
As the window's row hydration does when the row has no label.
* fix(layout): the Loader compares a lone pane title with the tab bar label, the live title (dark)