wallpaper: the preview above the list

The mock screens took a third of the width beside the list, which left
both cramped in the settings window. They now sit on top, sized to half
the width and capped so the upright screen stays under 200px, with the
notes and the actions beside them; the folder list takes the full width
and the rest of the height below. The actions are a Flow, so they wrap
instead of clipping in a narrow window.

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

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