feat(studio): PR-3i #4 · VoiceDesignModal + 我的设计 tab wired end-to-end

- VoiceDesignModal: write voice_prompt → preview → tweak → accept loop
- ✨ 由角色描述生成 button calls /voice/design/translate when character.description present
- VoicePickerModal Tab 3 now mirrors Tab 2: list + delete + auto-select on create
- i18n keys: voiceDesign.* + voicePicker.{designCreateBtn,designNeedsSeries}

Author: Mike4Ellis

frontend/messages/en.json

@@ -73,14 +73,33 @@
     "originClone": "Clone",
     "originDesign": "Design",
     "confirmDelete": "Delete this voice? Characters using it will become unbound.",
-    "designEmptyTitle": "Voice design — coming soon",
-    "designEmptyBody": "Describe the voice in one sentence (e.g. 'warm 30-something female') and AI generates a custom voice.",
+    "designEmptyTitle": "No designed voices yet",
+    "designEmptyBody": "Describe the voice you want (e.g. 'warm 30-something female') and AI generates a custom one.",
+    "designCreateBtn": "+ Design new voice",
+    "designNeedsSeries": "Link this project to a series first — designed voices are shared at series level.",
     "comingSoonInPR3i": "Ships in PR-3i",
     "noSelection": "Pick a voice",
     "cancel": "Cancel",
     "apply": "Apply",
     "playFailed": "Preview failed — please retry"
   },
+  "voiceDesign": {
+    "title": "Design a new voice",
+    "close": "Close",
+    "voicePromptLabel": "Voice description (100-500 chars, Chinese)",
+    "voicePromptPlaceholder": "Describe gender, age, timbre, pace, mood. e.g. 'Mature gentle woman, around 30, clear bright tone with a hint of sweetness, moderate pace, warm and intelligent.'",
+    "translateBtn": "✨ From character",
+    "previewTextLabel": "Preview text",
+    "generateBtn": "Generate preview",
+    "regenerateBtn": "Regenerate",
+    "labelLabel": "Voice name",
+    "labelPlaceholder": "e.g. Intelligent Lead",
+    "acceptBtn": "Save to my voices",
+    "cancel": "Cancel",
+    "done": "Saved",
+    "doneSaved": "Voice added to your design library",
+    "playFailed": "Preview failed — please retry"
+  },
   "previousFramesRail": {
     "title": "Previous episode ending",
     "framesCount": "{count, plural, =1 {1 frame} other {# frames}}",

frontend/messages/zh.json

@@ -73,14 +73,33 @@
     "originClone": "复刻",
     "originDesign": "设计",
     "confirmDelete": "确定要删除此音色吗？已绑定的角色会失效。",
-    "designEmptyTitle": "声音设计 — 即将上线",
-    "designEmptyBody": "用一句话描述期望的声音（如「温柔知性女声，30 岁左右」），AI 从零生成专属音色。",
+    "designEmptyTitle": "暂无设计音色",
+    "designEmptyBody": "描述你想要的音色（如「温柔知性女声，30 岁左右」），AI 从零生成专属音色。",
+    "designCreateBtn": "+ 设计新音色",
+    "designNeedsSeries": "需要先把项目关联到系列才能使用音色设计（设计音色按系列共享）",
     "comingSoonInPR3i": "PR-3i 即将交付",
     "noSelection": "请选择音色",
     "cancel": "取消",
     "apply": "应用",
     "playFailed": "试听失败，请重试"
   },
+  "voiceDesign": {
+    "title": "设计新音色",
+    "close": "关闭",
+    "voicePromptLabel": "音色描述（100-500 字中文）",
+    "voicePromptPlaceholder": "描述目标声音的性别、年龄、音色质感、语速、气质氛围等。例如：成熟温柔的女性，30 岁左右，音色清亮带点甜美，语速适中，温暖知性。",
+    "translateBtn": "✨ 由角色描述生成",
+    "previewTextLabel": "试听文本",
+    "generateBtn": "生成试听",
+    "regenerateBtn": "重新生成",
+    "labelLabel": "音色名称",
+    "labelPlaceholder": "例如：知性御姐",
+    "acceptBtn": "保存为我的音色",
+    "cancel": "取消",
+    "done": "已保存",
+    "doneSaved": "音色已加入我的设计库",
+    "playFailed": "试听失败，请重试"
+  },
   "previousFramesRail": {
     "title": "上一集结尾分镜",
     "framesCount": "{count} 帧",

frontend/src/components/modules/Cast.tsx

@@ -731,6 +731,7 @@ function CastCard({ item }: { item: CastItem }) {
                     currentVoiceId={voiceId}
                     onApply={handleApplyVoice}
                     seriesId={currentProject?.series_id || null}
+                    characterDescription={character.description}
                 />
             )}
         </>