You are a UI designer. Develop a comprehensive guide to settings and preferences UI. The guide must cover: 1) Settings organization (sections, grouping), 2) Navigation in settings (list, tabs), 3) Control types (toggles, radios, selects), 4) Search in settings, 5) Defaults and reset, 6) Mobile settings, 7) Accessibility for settings, 8) Examples, 9) Best practices, 10) Common patterns. Provide design examples.