音频信息的时长展示收敛到两位小数

模型返回的时长是全精度秒数，落库后信息面板会直出 8.306938775510204秒
这类无意义尾数。

- 新增 formatEditorGenerationInputFieldValue，只改写标题为「时长」或
  duration 的字段中的首个数字，四舍五入到两位小数
- 接入音频信息弹窗与导出的可见元数据两处用户可见出口
- 不补零，"自动"这类无数字取值与其他字段原样保留

只作用于展示：generationInputs 落库值不变，重绘默认时长与作品时长推断
仍按原精度解析，已有素材也一并生效。

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/components/image-editor/ImageCanvasExportModel.ts

@@ -7,6 +7,7 @@ import type {
 } from './ImageCanvasEditorTypes';
 import {
   DEFAULT_ICON_DESCRIPTIONS,
+  formatEditorGenerationInputFieldValue,
   formatLayerImageType,
   getEditorLayerModelDisplayName,
   isEditorUserVisibleGenerationInputField,
@@ -540,7 +541,7 @@ function buildVisibleGenerationInputs(layer: CanvasLayer) {
       .filter((field) => !isBuiltInGenerationInputField(field))
       .map((field) => ({
         title: field.title,
-        value: field.value,
+        value: formatEditorGenerationInputFieldValue(field),
       })) ?? [];
   const references =
     layer.generationInputs?.references.map((reference) => ({

src/components/image-editor/ImageCanvasGenerationModel.test.ts

@@ -39,6 +39,7 @@ import {
   EDITOR_SOUND_EFFECT_MODEL_OPTIONS,
   EDITOR_VIDEO_MODEL_MUD_POINT_CONFIG,
   EDITOR_VIDEO_MODEL_OPTIONS,
+  formatEditorGenerationInputFieldValue,
   getGenerationFrameAriaLabel,
   getGenerationFrameLabel,
   IMAGE_MODEL_GPT_IMAGE_2,
@@ -61,6 +62,23 @@ describe('ImageCanvasGenerationModel', () => {
     });
   });
 
+  it('展示时长时收敛到两位小数且不改动其他字段', () => {
+    const format = (title: string, value: string) =>
+      formatEditorGenerationInputFieldValue({ title, value });
+
+    expect(format('时长', '8.306938775510204秒')).toBe('8.31秒');
+    expect(format('时长', '3.4512秒')).toBe('3.45秒');
+    // 整数与一位小数不补零，"自动"这类无数字取值原样保留。
+    expect(format('时长', '5秒')).toBe('5秒');
+    expect(format('时长', '2.5秒')).toBe('2.5秒');
+    expect(format('时长', '自动')).toBe('自动');
+    expect(format('duration', '8.306938775510204s')).toBe('8.31s');
+    // 非时长字段一律原样返回，不能误伤提示词里的数字。
+    expect(format('用户描述', '持续 8.306938775510204 秒的低鸣')).toBe(
+      '持续 8.306938775510204 秒的低鸣',
+    );
+  });
+
   it('为所有编辑器生成模型提供显式定价配置', () => {
     expect(
       EDITOR_IMAGE_MODEL_OPTIONS.map((option) => option.value).filter(

src/components/image-editor/ImageCanvasGenerationModel.ts

@@ -637,6 +637,30 @@ export function isEditorUserVisibleGenerationInputField(
   return field.title.trim() !== '处理模型';
 }
 
+const GENERATION_INPUT_DURATION_TITLES = new Set(['时长', 'duration']);
+const GENERATION_INPUT_DURATION_DECIMALS = 2;
+
+/**
+ * 时长字段落库的是模型返回的全精度秒数（例如 8.306938775510204 秒），展示时收敛到两位
+ * 小数。只作用于渲染：底层字段保持原值，重绘默认时长与作品时长推断仍按原精度解析。
+ */
+export function formatEditorGenerationInputFieldValue(
+  field: CanvasGenerationInputField,
+) {
+  if (!GENERATION_INPUT_DURATION_TITLES.has(field.title.trim().toLowerCase())) {
+    return field.value;
+  }
+  // 只改写首个数字，"自动"这类无数字取值和"秒"后缀都原样保留。
+  return field.value.replace(/\d+(?:\.\d+)?/u, (matched) => {
+    const parsed = Number.parseFloat(matched);
+    if (!Number.isFinite(parsed)) {
+      return matched;
+    }
+    const factor = 10 ** GENERATION_INPUT_DURATION_DECIMALS;
+    return String(Math.round(parsed * factor) / factor);
+  });
+}
+
 export function getEditorLayerModelDisplayName(
   model: string | null | undefined,
 ) {

src/components/image-editor/ImageCanvasMetadataModalView.tsx

@@ -2,6 +2,7 @@ import { UnifiedModal } from '../common/UnifiedModal';
 import type { CanvasLayer } from './ImageCanvasEditorTypes';
 import { formatTaskIdForDisplay } from './ImageCanvasExportModel';
 import {
+  formatEditorGenerationInputFieldValue,
   formatLayerImageType,
   getEditorLayerModelDisplayName,
   isEditorUserVisibleGenerationInputField,
@@ -63,7 +64,7 @@ export function ImageCanvasMetadataModalView({
                     <span className="image-canvas-editor__metadata-input-title">
                       {field.title}
                     </span>
-                    <span>{field.value}</span>
+                    <span>{formatEditorGenerationInputFieldValue(field)}</span>
                   </div>
                 ))}
                 {generationInputReferences.length ? (