fix(discover): 封面完整显示并移除图上标题

test/discover/home_all_dramas_grid_test.dart

@@ -84,6 +84,26 @@ void main() {
             .height,
         120,
       );
+      final cover = find.byKey(const Key('home-drama-cover-city-lights-demo'));
+      expect(
+        tester
+            .widget<RemoteImage>(
+              find.descendant(of: cover, matching: find.byType(RemoteImage)),
+            )
+            .fit,
+        BoxFit.contain,
+      );
+      expect(
+        find.descendant(
+          of: cover,
+          matching: find.text('City Lights & Velvet Nights'),
+        ),
+        findsNothing,
+      );
+      expect(
+        find.byKey(const Key('home-drama-title-city-lights-demo')),
+        findsOneWidget,
+      );
       expect(
         tester
             .widget<Text>(