Prepare 0.7.9 with decisive Dock tap transitions

mobile/test/widgets/dock_motion_test.dart

@@ -11,6 +11,30 @@ import 'navigation_test.dart' show uiController;
 
 void main() {
   setUpAll(tzdata.initializeTimeZones);
+  testWidgets(
+    'tap reaches its page promptly and finishes the glass pulse within 480ms',
+    (tester) async {
+      await tester.pumpWidget(_dock());
+      await tester.pumpAndSettle();
+      final lens = find.byType(GlassRefraction).last;
+      final rest = tester.getSize(lens);
+      final target = tester.getCenter(find.byIcon(Icons.assignment_rounded)).dx;
+      await tester.tap(find.byIcon(Icons.assignment_rounded));
+      await tester.pump();
+      await tester.pump(const Duration(milliseconds: 160));
+      expect((tester.getCenter(lens).dx - target).abs(), lessThan(7));
+      for (var i = 0; i < 20; i++) {
+        await tester.pump(const Duration(milliseconds: 16));
+      }
+      expect(
+        find.byKey(const ValueKey('dock-symbol-refraction')),
+        findsNothing,
+      );
+      expect(tester.getSize(lens).width, closeTo(rest.width, 0.5));
+      expect(tester.getCenter(lens).dx, closeTo(target, 0.6));
+      await tester.pumpAndSettle();
+    },
+  );
   testWidgets(
     'moving lens refracts symbols above the icon row and releases cleanly',
     (tester) async {

mobile/test/widgets/glass_dock_test.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:hepan_everyday/widgets/glass_dock.dart';
+import 'package:hepan_everyday/widgets/tab_deck.dart';
 import 'package:hepan_everyday/app/hepan_app.dart';
 import 'package:hepan_everyday/features/timetable/timetable_page.dart';
 import 'package:timezone/data/latest.dart' as tzdata;
@@ -9,6 +10,31 @@ import 'navigation_test.dart' show uiController;
 
 void main() {
   setUpAll(tzdata.initializeTimeZones);
+  testWidgets(
+    'tab content finishes within one frame of 240ms and retains page state',
+    (tester) async {
+      Widget deck(int index) => MaterialApp(
+        home: Scaffold(
+          body: TabDeck(
+            index: index,
+            children: const [TextField(), Text('新页面')],
+          ),
+        ),
+      );
+      await tester.pumpWidget(deck(0));
+      await tester.enterText(find.byType(TextField), '保留内容');
+      FocusManager.instance.primaryFocus?.unfocus();
+      await tester.pumpWidget(deck(1));
+      await tester.pump(); // Start the transition clock before advancing it.
+      await tester.pump(const Duration(milliseconds: 240));
+      await tester.pump(const Duration(milliseconds: 16));
+      expect(find.byType(TextField), findsNothing);
+      expect(find.text('新页面'), findsOneWidget);
+      await tester.pumpWidget(deck(0));
+      await tester.pumpAndSettle();
+      expect(find.text('保留内容'), findsOneWidget);
+    },
+  );
   testWidgets('only the selected tab is blue, including during glass travel', (
     tester,
   ) async {