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/ImageCanvasGenerationDialogModel.test.ts

@@ -74,6 +74,28 @@ describe('ImageCanvasGenerationDialogModel', () => {
         originalHeight: 1024,
       },
     });
+    expect(
+      createSpecDialogDraft({ canvasSize, viewport, specType: 'character' }),
+    ).toMatchObject({
+      mode: 'spec',
+      specType: 'character',
+      specValues: {
+        playSetting: '',
+        artStyle: '',
+        bodyRatio: '3',
+      },
+    });
+    expect(
+      createSpecDialogDraft({ canvasSize, viewport, specType: 'ui' }),
+    ).toMatchObject({
+      mode: 'spec',
+      specType: 'ui',
+      specValues: {
+        playSetting: '',
+        artStyle: '',
+        bodyRatio: '3',
+      },
+    });
     expect(
       createSpecDialogDraft({ canvasSize, viewport, specType: 'icon' }),
     ).toMatchObject({
@@ -153,16 +175,9 @@ describe('ImageCanvasGenerationDialogModel', () => {
       imageModel: 'unknown-model',
       aspectRatio: '1:1',
       imageSize: '1K',
-      prompt: '返回按钮\n设置按钮\n下一关按钮\n提示按钮\n原图按钮\n冻结按钮',
+      prompt: '',
       iconSpecReference: null,
-      iconDescriptions: [
-        '返回按钮',
-        '设置按钮',
-        '下一关按钮',
-        '提示按钮',
-        '原图按钮',
-        '冻结按钮',
-      ],
+      iconDescriptions: [],
       placeholder: {
         x: 300,
         y: 180,
@@ -228,8 +243,7 @@ describe('ImageCanvasGenerationDialogModel', () => {
     expect(createSoundEffectGenerationDialogDraft({ canvasSize, viewport }))
       .toMatchObject({
         mode: 'audio-sound-effect',
-        prompt:
-          '短促清脆的游戏交互音效，带轻微闪光质感，干净收尾，适合按钮确认或收集奖励。',
+        prompt: '',
         status: 'idle',
         composerOpen: true,
         soundModel: 'audio1.0',
@@ -246,8 +260,7 @@ describe('ImageCanvasGenerationDialogModel', () => {
     expect(createBackgroundMusicGenerationDialogDraft({ canvasSize, viewport }))
       .toMatchObject({
         mode: 'audio-background-music',
-        prompt:
-          '适合轻松冒险游戏的循环背景音乐，温暖明亮，旋律简洁，不包含人声。',
+        prompt: '',
         status: 'idle',
         composerOpen: true,
         makeInstrumental: true,