feat(settings): Appearance category + custom-control escape hatch (T-452)

Add the one bespoke control the schema engine defers to. New
SettingsControlContribution routes a WidgetBuilder into a kernel
SettingsControlRegistry under a customId; a SettingsFieldKind.custom field
names that id, and the renderer draws the registered widget full-width
(label on top, no scope tag — the control owns its own apply + scope).

The theme-picker extension uses it: an Appearance category whose theme field
is custom, backed by AppearanceThemeControl — base-theme chips + a
high-contrast toggle that apply live through ThemeController (persisted by
theme_persistence). Reuses the shared theme_families helpers.

Tests: control registry (register/dup/unregister), the renderer's custom-field
path, and the Appearance contribution + live theme apply.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

This commit is contained in:

jpmschweitzer

2026-06-17 13:04:52 +02:00

co-authored by

Claude Opus 4.8

parent 727fe8fdd4

commit 757d6f71fa

16 changed files with 324 additions and 14 deletions

									
										lib/kernel/kernel.dart
									
		+1
		
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				@@ -22,6 +22,7 @@ export 'src/watchdog.dart';

				export 'src/settings.dart';

				export 'src/settings_schema.dart';

				export 'src/settings_registry.dart';

				export 'src/settings_control_registry.dart';

				export 'src/facade.dart';

				export 'src/clipboard.dart';

				export 'src/commands/keybindings.dart';