fix(viral-video): 推翻暗色主题改回浅色紫色主题 + 6项UI调整 (#2136)

- 全站配色从深蓝黑cyan改回白底紫色系（参考AI数字人页：#f5f6fa页面/#fff卡片/#7c3aed主紫）
- 问题1：文案融合三选项改为1行3列横排，选中紫边+浅紫底#f5f0ff
- 问题2：AI润色和按我写的来都显示textarea，placeholder区分
- 问题3：成片超分改为5选项（默认/普清/高清/超清/全能），默认值default
- 问题4：人设改为10个IP类型+placeholder「请选择人设类型」
- 问题5：分镜脚本线性文档排版保留，颜色改浅色（白底+深灰标签+深灰文字+紫色时间标题）
- 问题6：STEP3 2x2网格保留，白底灰边Select+紫色focus+积分数字紫色+预览白底虚线
- 清除所有cyan(#22d3ee/#06b6d4)和深蓝黑(#0b1220/#111a2e)残留色值
- 保留：select单边框/分析不锁页/步骤解锁/19项结构/多行分析/阶段进度提示

apps/web/src/pages/viral-video/ViralVideoPage.tsx

@@ -151,7 +151,18 @@ const TARGET_CUSTOMERS = [
   "都市蓝领",
   "都市银发",
 ]
-const PERSONAS = ["亲切邻家姐姐", "专业顾问", "搞笑段子手", "真实测评博主", "闺蜜种草", "行业专家"]
+const PERSONAS = [
+  "通用个人IP",
+  "老板型IP",
+  "专家型IP",
+  "顾问型IP",
+  "创始人IP",
+  "创业者IP",
+  "从业者经验派",
+  "避坑顾问型",
+  "知识科普型",
+  "测评种草型",
+]
 const STRUCTURES = [
   "反差破局+亮明观点+还原现状",
   "痛点场景植入+给出通关秘籍",
@@ -190,8 +201,11 @@ const QUALITY_OPTIONS = [
   { v: "1080p", label: "1080p（高清）" },
 ]
 const UPSCALE_OPTIONS = [
-  { v: "关闭", label: "关闭" },
-  { v: "开启", label: "开启" },
+  { v: "default", label: "默认" },
+  { v: "sd", label: "普清" },
+  { v: "hd", label: "高清" },
+  { v: "uhd", label: "超清" },
+  { v: "omnipotent", label: "全能" },
 ]
 const VOICE_TIPS =
   "支持 MP3/WAV/M4A/AAC/OGG 格式，最大 10MB，时长 ≤30 秒。建议清晰人声、无背景音乐、环境安静；录音请保持距麦克风 15-20cm，音量适中。"
@@ -358,7 +372,7 @@ const emptyTask = (id: string, title: string): TabTask => ({
   videoRatio: "9:16",
   videoModel: "seedance-2.5",
   quality: "480p",
-  upscale: "关闭",
+  upscale: "default",
   uiStep: "step1_upload",
   imageAnalysis: null,
   storyboard: null,
@@ -975,7 +989,7 @@ const ViralVideoPage: React.FC = () => {
       return (
         <div className="vv-recog">
           <div className="vv-recog-title">
-            <LoadingOutlined style={{ color: "#22d3ee", marginRight: 6 }} />
+            <LoadingOutlined style={{ color: "#7c3aed", marginRight: 6 }} />
             识别描述汇览
           </div>
           <div className="vv-muted">AI 正在识别商品特征…</div>
@@ -1355,7 +1369,7 @@ const ViralVideoPage: React.FC = () => {
           {/* 完整口播稿（可折叠） */}
           <h4 className="vv-sb-h">
             <button className="vv-sb-doc-collapse" onClick={() => setVoOpen(!voOpen)} type="button">
-              <SoundOutlined style={{ color: "#22d3ee", marginRight: 6 }} />
+              <SoundOutlined style={{ color: "#7c3aed", marginRight: 6 }} />
               完整口播稿（TTS 合成使用）
               <span className={`vv-sb-caret ${voOpen ? "open" : ""}`}>▾</span>
             </button>
@@ -1676,7 +1690,7 @@ const ViralVideoPage: React.FC = () => {
                 />
                 {task.refAudio && (
                   <div className="vv-selected-audio">
-                    <SoundOutlined style={{ color: "#22d3ee", marginRight: 6 }} />
+                    <SoundOutlined style={{ color: "#7c3aed", marginRight: 6 }} />
                     <span style={{ flex: 1 }}>已选：{task.refAudio.name}</span>
                     <button
                       className="vv-link-btn"
@@ -1801,12 +1815,19 @@ const ViralVideoPage: React.FC = () => {
                   </button>
                 ))}
               </div>
-              {task.fusionLevel === "user_primary" && (
+              {(task.fusionLevel === "ai_polish" || task.fusionLevel === "user_primary") && (
                 <div className="vv-form-row">
-                  <label className="vv-label">写下你的文案/草稿</label>
+                  <label className="vv-label">
+                    {task.fusionLevel === "ai_polish" ? "写下你的文案草稿" : "写下你的文案/草稿"}
+                  </label>
                   <textarea
+                    key={task.fusionLevel}
                     className="vv-textarea"
-                    placeholder="请输入你想要的原始文案，AI 将严格保留你的表达"
+                    placeholder={
+                      task.fusionLevel === "ai_polish"
+                        ? "请输入你的文案草稿，AI将在此基础上润色优化..."
+                        : "请输入你想要的原始文案，AI将严格保留你的表达..."
+                    }
                     value={task.userCopy}
                     onChange={(e) => setTask({ userCopy: e.target.value })}
                     disabled={!canEditStep2}
@@ -1857,11 +1878,11 @@ const ViralVideoPage: React.FC = () => {
                   <Select
                     className="vv-select vv-select-purple"
                     style={{ width: "100%" }}
-                    placeholder="请选择人设"
+                    placeholder="请选择人设类型"
+                    optionFilterProp="children"
                     value={task.persona || undefined}
                     onChange={(v) => setTask({ persona: v })}
                     options={PERSONAS.map((i) => ({ value: i, label: i }))}
-                    allowClear
                     disabled={!canEditStep2}
                   />
                 </div>
@@ -2036,7 +2057,7 @@ const ViralVideoPage: React.FC = () => {
                 ) : task.uiStep === "step3_generating" ? (
                   <div className="vv-preview-placeholder">
                     <div className="ph-icon">
-                      <LoadingOutlined style={{ fontSize: 36, color: "#22d3ee" }} />
+                      <LoadingOutlined style={{ fontSize: 36, color: "#7c3aed" }} />
                     </div>
                     <div className="ph-txt">
                       AI 正在生成视频中…