feat(tokens): add design tokens, type scale, push scaffold, and root nav state

test/tema/pluriwave_typography_test.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:pluriwave/tema/pluriwave_theme.dart';
+import 'package:pluriwave/tema/pluriwave_typography.dart';
+
+/// Design ADR-1: the named type scale is a second ThemeExtension, closed at
+/// six styles. Pins the documented size/weight/letter-spacing per style and
+/// confirms PluriWaveTheme.dark() registers it, mirroring how
+/// PluriWaveTokens/PluriWaveMotion are already tested.
+///
+/// PluriWaveTheme.dark() is only ever resolved from inside a testWidgets
+/// callback (never from setUpAll or a plain test()). GoogleFonts.
+/// plusJakartaSansTextTheme fires a background network fetch per text role;
+/// TestWidgetsFlutterBinding only installs its HTTP-blocking override
+/// inside an active test-widgets zone, so calling PluriWaveTheme.dark()
+/// outside one lets a real (and here unreachable) network request escape
+/// and fail asynchronously. The numeric values asserted below (fontSize/
+/// weight/letterSpacing/height) are set synchronously by
+/// PluriWaveTypography.from regardless of that background fetch's outcome.
+void main() {
+  late PluriWaveTypography type;
+
+  group('PluriWaveTypography', () {
+    testWidgets('PluriWaveTheme.dark() registers the extension', (
+      tester,
+    ) async {
+      final theme = PluriWaveTheme.dark();
+      final extension = theme.extension<PluriWaveTypography>();
+      expect(extension, isNotNull);
+      type = extension!;
+    });
+
+    test('heroTime is 88 / w800 / height 1.0 / letter-spacing -2.0', () {
+      expect(type.heroTime.fontSize, 88);
+      expect(type.heroTime.fontWeight, FontWeight.w800);
+      expect(type.heroTime.height, 1.0);
+      expect(type.heroTime.letterSpacing, -2.0);
+    });
+
+    test('sectionTitle is 23 / w800 / letter-spacing -0.6', () {
+      expect(type.sectionTitle.fontSize, 23);
+      expect(type.sectionTitle.fontWeight, FontWeight.w800);
+      expect(type.sectionTitle.letterSpacing, -0.6);
+    });
+
+    test('screenTitle is 19 / w800 / letter-spacing -0.4', () {
+      expect(type.screenTitle.fontSize, 19);
+      expect(type.screenTitle.fontWeight, FontWeight.w800);
+      expect(type.screenTitle.letterSpacing, -0.4);
+    });
+
+    test('cardTitle is 14.5 / w700', () {
+      expect(type.cardTitle.fontSize, 14.5);
+      expect(type.cardTitle.fontWeight, FontWeight.w700);
+    });
+
+    test('bodyStrong is 13 / w600', () {
+      expect(type.bodyStrong.fontSize, 13);
+      expect(type.bodyStrong.fontWeight, FontWeight.w600);
+    });
+
+    test('eyebrowLabel is 11 / w800 / letter-spacing 0.8', () {
+      expect(type.eyebrowLabel.fontSize, 11);
+      expect(type.eyebrowLabel.fontWeight, FontWeight.w800);
+      expect(type.eyebrowLabel.letterSpacing, 0.8);
+    });
+
+    testWidgets('context.pluriType exposes the registered extension', (
+      tester,
+    ) async {
+      late BuildContext capturedContext;
+      await tester.pumpWidget(
+        MaterialApp(
+          theme: PluriWaveTheme.dark(),
+          home: Builder(
+            builder: (context) {
+              capturedContext = context;
+              return const SizedBox.shrink();
+            },
+          ),
+        ),
+      );
+
+      expect(capturedContext.pluriType.cardTitle.fontSize, 14.5);
+    });
+  });
+}