feat(player): 右侧互动栏图标按参考图替换并放大

test/home/home_preview_layout_test.dart

@@ -150,6 +150,39 @@ void main() {
       tester.widget<Text>(find.byKey(const Key('rail-comments-count'))).data,
       '12',
     );
+    expect(
+      find.descendant(
+        of: find.byKey(const Key('rail-save')),
+        matching: find.byIcon(Icons.star_rounded),
+      ),
+      findsOneWidget,
+    );
+    expect(
+      find.descendant(
+        of: find.byKey(const Key('rail-like')),
+        matching: find.byIcon(Icons.favorite_rounded),
+      ),
+      findsOneWidget,
+    );
+    expect(
+      find.descendant(
+        of: find.byKey(const Key('rail-share')),
+        matching: find.byIcon(Icons.reply_rounded),
+      ),
+      findsOneWidget,
+    );
+    expect(
+      tester
+          .widget<Transform>(
+            find.descendant(
+              of: find.byKey(const Key('rail-share')),
+              matching: find.byType(Transform),
+            ),
+          )
+          .transform
+          .storage[0],
+      -1,
+    );
     expect(find.byKey(const Key('progress-loading')), findsOneWidget);
     expect(find.byKey(const Key('home-feed-progress-thumb')), findsNothing);
   });

test/player/player_fullscreen_test.dart

@@ -466,7 +466,7 @@ void main() {
 
     expect(bottom.height, lessThanOrEqualTo(200));
     expect(bottom.top, greaterThanOrEqualTo(screenHeight * 0.78));
-    expect(rail.top, greaterThanOrEqualTo(screenHeight * 0.55 - 2));
+    expect(rail.top, greaterThanOrEqualTo(screenHeight * 0.40));
     expect(rail.bottom, lessThanOrEqualTo(bottom.top));
     expect(find.byKey(const Key('player-author-note')), findsNothing);
     expect(
@@ -478,7 +478,7 @@ void main() {
             ),
           )
           .width,
-      24,
+      30,
     );
 
     await tester.tap(find.byKey(const Key('player-synopsis-toggle')));
@@ -580,6 +580,74 @@ void main() {
     expect(railLabel(const Key('player-rail-save')), '3201');
   });
 
+  testWidgets('should_render_reference_rail_icons_without_background', (
+    tester,
+  ) async {
+    await _pumpApp(tester);
+    await _openSeriesPlayer(tester);
+
+    Finder railIcon(Key key, IconData icon) =>
+        find.descendant(of: find.byKey(key), matching: find.byIcon(icon));
+    expect(
+      railIcon(const Key('player-rail-save'), Icons.star_rounded),
+      findsOneWidget,
+    );
+    expect(
+      railIcon(const Key('player-rail-like'), Icons.favorite_rounded),
+      findsOneWidget,
+    );
+    expect(
+      railIcon(
+        const Key('player-rail-comments'),
+        Icons.chat_bubble_outline_rounded,
+      ),
+      findsOneWidget,
+    );
+    final shareIcon = railIcon(
+      const Key('player-rail-share'),
+      Icons.reply_rounded,
+    );
+    expect(shareIcon, findsOneWidget);
+    expect(tester.widget<Icon>(shareIcon).size, 30);
+
+    final mirror = tester.widget<Transform>(
+      find.descendant(
+        of: find.byKey(const Key('player-rail-share')),
+        matching: find.byType(Transform),
+      ),
+    );
+    expect(mirror.transform.storage[0], -1);
+
+    final saveButton = tester.widget<IconButton>(
+      find.descendant(
+        of: find.byKey(const Key('player-rail-save')),
+        matching: find.byType(IconButton),
+      ),
+    );
+    expect(saveButton.style?.backgroundColor, isNull);
+    expect(
+      tester.getSize(
+        find.descendant(
+          of: find.byKey(const Key('player-rail-save')),
+          matching: find.byType(IconButton),
+        ),
+      ),
+      const Size(44, 44),
+    );
+    expect(
+      tester
+          .widget<Text>(
+            find.descendant(
+              of: find.byKey(const Key('player-rail-like')),
+              matching: find.byType(Text),
+            ),
+          )
+          .style
+          ?.fontSize,
+      12,
+    );
+  });
+
   testWidgets('should_toggle_synopsis_with_inline_text_button', (tester) async {
     await _pumpApp(tester);
     await _openSeriesPlayer(tester);