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feat: follow macOS light/dark appearance via ghostty's dual theme value (#74)

* feat: follow macOS light/dark appearance via ghostty's dual theme value

The AppSettings.theme field now holds either a plain bundled name or
ghostty's native dual form (light:NAME,dark:NAME) - the dual form IS the
"track the macOS appearance" state, exactly ghostty's own model (and
kitty's presence-of-the-dark-variant opt-in). No extra fields, no toggle.

The pinned libghostty cannot switch a dual theme value at runtime, so
agterm resolves the active side itself (ThemeResolution, host-free) and
rewrites + reloads the config when the OS appearance flips (a surface's
viewDidChangeEffectiveAppearance posts .agtermSystemAppearanceChanged;
SettingsModel debounces and no-ops when the resolved side is unchanged).

Settings UI: two always-visible pickers, no toggle. "Theme" (relabeled
"Light theme" while a dark theme is set) and "Dark theme" with a "none"
row - picking a dark theme composes the dual value (the light side seeds
from the current theme, else Builtin Light); "none" collapses back to
the plain theme.

Theme palette (View > Select Theme...): previews are plain names that
naturally override the dual value; commit replaces the CURRENT
appearance's side (the pair is kept); committing "default ghostty" over
a pair collapses to no theme. The picker badges/opens on the effective
(on-screen) theme.

Control API, per-slot (mirrors the pickers over the same SettingsModel
setters): `theme set NAME` sets the light/single slot keeping a dark
slot; `theme set --dark NAME` sets the dark slot (starts syncing);
`theme set --dark none` clears it; `--light X --dark Y` sets both; bare
`theme set` resets to ghostty's built-in. Responses echo the full state
(result.theme / sync / light / dark; theme absent while syncing).
theme.list carries the same sync state; the CLI marks both sides and
prints a header while syncing.

Chrome follows: selection colors re-resolve per appearance, COLOR_CH... (continued)

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