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Settings source appearance and configuration pages

Pinned reference: 7338078f8ddd924b8cddee35f512f2286072136d, SettingsColors.cpp, SettingsColors2.cpp, SettingsColors3.cpp, SettingGitConfig.cpp, SetDialogs3.cpp and GitSettings.h.

This batch preserves the earlier Settings OK/Cancel owner and Remote list fixes; see SETTINGS-SHEET-PARITY.md and REMOTE-SETTINGS-PARITY.md. It does not add a second Remote configuration writer or replace its existing list/selection rules.

Appearance now belongs to the property sheet transaction from construction. A command which opens directly on Colors 1 can preview Dark theme and Apply/OK it without first visiting General. General uses that same participant when embedded; standalone General retains its original participant. Visiting a cached page does not replace the property's appearance registration. Cancel restores the committed choice, and forced retirement removes the preview before deferred draft disposal.

The pinned Colors 1 theme button updates the live property sheet immediately. The native adaptation previews Follow System/Light/Dark through bounded, owner-identified application appearance overrides without saving preferences. Multiple preview owners retain independent receipts; retiring one cannot remove another's preview. Apply commits through AppAppearance, and Cancel/closure returns to the latest committed application choice. Retired native theme controls reject retained actions. This does not claim physical multi-window or system-theme event acceptance beyond the recorded checks.

Git, Dialogs 3 and Colors 1/2/3 use compact thin group frames instead of rounded cards. Their scoped radio controls share the source hierarchy order and separators; Git omits Project as upstream does, while Dialogs 3 retains it. Actual model source selection, inherited fields, destination warnings, scoped saves and config editors remain in place. Dialogs 3 aligns the overlay's inheritance control with its path and Browse control. The earlier property-sheet scroll viewport and footer remain.

Color pages now show draft status-text/reference-label samples. Colors 3 draws all eight lane colors with the actual draft line width and node size. These previews use the same palette/theme conversion as Log, including high contrast, and never write temporary preference values. Restore Default and Cancel update the preview through the existing draft. The extra examples are a native usability adaptation, not additional upstream configuration controls.

Line width and node size use explicit native combo boxes with the source ranges 1–10 and 1–30. They retain the original owning window, reject retired controls and update the existing draft rather than saving a temporary preference.

qa/primary-settings-appearance-native-2026-10-21.swift is the grouped receiver fixture for direct-page theme preview/Apply/Cancel, cached General identity, retired controls, real color/dimension inputs and scoped Git/project inheritance. It uses private preferences/repositories and closes its owned windows. Optional captures use TURTLEGIT_PRIMARY_PARITY_CAPTURES and remain offscreen. The grouped checkpoint record reports actual attempts and results. Complete dialog parity, physical keyboard/VoiceOver, all locales, external config races and signed/App Store behavior remain open.