feat(desktop): the mouse back button steps out of the drawer

The side button (BTN_SIDE, Qt.BackButton) does what Escape does: closes
the history, then leaves a page for the tiles, then closes the drawer.
Both go through one back(). The first attempt let the press fall through
to the full-surface click catcher under the panel, since nothing above
it accepts that button; it never arrived while a page was open. A
MouseArea on top with z: 1, taking only the back button, works, and
left clicks still pass through it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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