feat(deckit): split the settings into a deck-it group of four pages

The single long deck-it page becomes its own sidebar group: General
(status, Restart, Start, Display, Advanced), Dashboard (Modules, action
icons, Hardware), Windows (launchers, workspaces) and Services (OBS, LLM,
K1C, build VM). All four share DeckIt.store, so Save on any page writes
the whole draft, as the Mail pages do. Each module lists its own fields,
so a search jumps to the page holding the field. The small-print text
moves to a shared Small.qml.

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

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