优化各元素输入框中的启发提示文本

音效、背景音乐和图标素材改为空值加灰色启发提示。

角色规范、图标规范和自定义规范输入框补充灰色启发提示。

同步更新相关前端组件测试。

src/components/image-editor/ImageCanvasSpecGenerationPanelView.test.tsx

@@ -161,6 +161,13 @@ describe('ImageCanvasSpecGenerationPanelView', () => {
       onUpdateSpecFormValue: updateSpecFormValue,
     });
 
+    expect(
+      (screen.getByLabelText('玩法设定') as HTMLInputElement).placeholder,
+    ).toBe('这是什么类型的游戏？');
+    expect(
+      (screen.getByLabelText('美术风格') as HTMLInputElement).placeholder,
+    ).toBe('游戏的画风是怎样的？');
+
     fireEvent.change(screen.getByLabelText('玩法设定'), {
       target: { value: '战棋玩法' },
     });
@@ -183,6 +190,34 @@ describe('ImageCanvasSpecGenerationPanelView', () => {
     );
   });
 
+  it('uses gameplay and art style hints for icon specs', () => {
+    renderPanel({
+      dialog: createSpecDialog({
+        specType: 'ui',
+        specValues: {
+          playSetting: '',
+          artStyle: '',
+          bodyRatio: '3',
+          characterView: '右向斜侧身站姿',
+          customPrompt: '',
+        },
+      }),
+    });
+
+    expect((screen.getByLabelText('玩法设定') as HTMLInputElement).value).toBe(
+      '',
+    );
+    expect(
+      (screen.getByLabelText('玩法设定') as HTMLInputElement).placeholder,
+    ).toBe('这是什么类型的游戏？');
+    expect((screen.getByLabelText('美术风格') as HTMLInputElement).value).toBe(
+      '',
+    );
+    expect(
+      (screen.getByLabelText('美术风格') as HTMLInputElement).placeholder,
+    ).toBe('游戏的画风是怎样的？');
+  });
+
   it('renders custom prompt and hides reference upload for icon specs', () => {
     const updateSpecFormValue = vi.fn();
     renderPanel({
@@ -199,6 +234,13 @@ describe('ImageCanvasSpecGenerationPanelView', () => {
       onUpdateSpecFormValue: updateSpecFormValue,
     });
 
+    const customPrompt = screen.getByLabelText(
+      '自定义规范提示词',
+    ) as HTMLTextAreaElement;
+    expect(customPrompt.placeholder).toBe(
+      '写下你想要的任何内容，陶泥儿帮你形成新的约束',
+    );
+
     fireEvent.change(screen.getByLabelText('自定义规范提示词'), {
       target: { value: '新的规范提示' },
     });