Halkyon's shared packages

A pub workspace of the Dart packages Halkyon's apps share: halkyon_ui,
Halkyon's look (the theme, fonts, layout and shared widgets, with texts
in English and German), halkyon_core's low-level primitives and
halkyon_interop's cross-app contracts. Dart 3.13 with LeanCode's lints,
configured once at the root; apps take a package by git, pinned to a
signed commit.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

packages/halkyon_ui/test/l10n/halkyon_ui_localizations_test.dart

@@ -0,0 +1,47 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:halkyon_ui/halkyon_ui.dart';
+import 'package:material_ui/material_ui.dart';
+
+import '../support/test_app.dart';
+
+void main() {
+  test('speaks British English, American English and German', () {
+    expect(
+      lookupHalkyonUiLocalizations(const Locale('en')).colorPickerLabel('X'),
+      'Colour: X',
+    );
+    expect(
+      lookupHalkyonUiLocalizations(
+        const Locale('en', 'GB'),
+      ).colorPickerLabel('X'),
+      'Colour: X',
+    );
+    expect(
+      lookupHalkyonUiLocalizations(
+        const Locale('en', 'US'),
+      ).colorPickerLabel('X'),
+      'Color: X',
+    );
+    expect(
+      lookupHalkyonUiLocalizations(const Locale('de')).colorPickerLabel('X'),
+      'Farbe: X',
+    );
+  });
+
+  testWidgets("an app adding the package's delegate gets its texts in the "
+      "app's language", (tester) async {
+    await tester.pumpWidget(
+      testApp(
+        locale: const Locale('de'),
+        ReorderToggle(
+          reordering: false,
+          labelled: true,
+          tooltip: 'Pfade umsortieren',
+          onToggle: () {},
+        ),
+      ),
+    );
+
+    expect(find.text('Umsortieren'), findsOneWidget);
+  });
+}