desktop: the settings window gets a landing page

The page header's back arrow closed the whole window, which reads wrong
for a back button. The window now opens on a landing page, a tile per
settings page in the drawer's own Tile, and back and Escape step out to
it; Escape there closes the window, as on the drawer's grid. An empty or
unknown name opens it, so the gear tile and ipc toggle land there.

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

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