docs(spec): fold the wallpaper-manager input into desktop-settings scope

Craig's 2026-07-04 roam input on the panel's open "few other things" question: it gathers the mouse/trackpad, no-sleep, and auto-dim toggles and adds a wallpaper manager (where the displaced waypaper lands) with its own depth — multiple source directories, persistent switching, and a sunup/sundown day-night pair. Flagged that the wallpaper piece may warrant its own sub-spec.

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