统一SFX提示词 trim 规范化

将 SFX Prompt 首尾规范化改为 ECMAScript String.trim 语义并同步 Rust 等值实现

更新共享边界 fixture、前后端与 Worker 回归测试

同步权威设计、实施计划、决策日志和 External OpenAPI 描述

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

@@ -39,7 +39,7 @@ describe('ImageCanvasSoundEffectPromptModel', () => {
   });
 
   it('accepts 2048 code points and rejects 2049 without truncating', () => {
-    const maximum = `\u0085${'😀'.repeat(
+    const maximum = `\uFEFF${'😀'.repeat(
       SOUND_EFFECT_PROMPT_MAX_CODE_POINTS,
     )}\u2003`;
     const accepted = validateSoundEffectPrompt(maximum);
@@ -59,7 +59,7 @@ describe('ImageCanvasSoundEffectPromptModel', () => {
   });
 
   it('rejects empty canonical prompts without adding a default description', () => {
-    for (const prompt of ['', ' \t\r\n', '\u0085\u2003\u00a0']) {
+    for (const prompt of ['', ' \t\r\n', '\uFEFF\u2003\u00a0']) {
       expect(validateSoundEffectPrompt(prompt)).toEqual({
         ok: false,
         prompt: '',
@@ -74,7 +74,7 @@ describe('ImageCanvasSoundEffectPromptModel', () => {
     const started = model.beginOperation({
       dialogId: 'dialog-a',
       status: 'optimizing',
-      prompt: '\u0085金币落地声\u3000',
+      prompt: '\uFEFF金币落地声\u3000',
     });
     expect(started.started).toBe(true);
     expect(started.canonicalPrompt).toBe('金币落地声');