feat: MyWorks 添加 TanStack Virtual 虚拟滚动 + TTS 预估剔除标点

- 成品网格：按行虚拟滚动，>50 个时启用，ResizeObserver 动态计算列数
- 草稿列表：始终启用虚拟滚动
- TTS 积分预估：剔除标点/空白，仅统计中文字、英文、数字

tauri-app/src/pages/ContentManagement/MyWorks.tsx

@@ -1,4 +1,5 @@
 import { useState, useEffect, useRef } from 'react';
+import { useVirtualizer } from '@tanstack/react-virtual';
 import { invoke } from '@tauri-apps/api/core';
 import { openPath } from '@tauri-apps/plugin-opener';
 import { getLocalFileUrl } from '../../utils/fileUrl';
@@ -285,6 +286,43 @@ export default function MyWorks() {
   const [editDraftTitle, setEditDraftTitle] = useState('');
   const { navigate } = useNavigation();
 
+  // ── 虚拟滚动 ───────────────────────────────────────────────
+  const draftsListRef = useRef<HTMLDivElement>(null);
+  const productsGridRef = useRef<HTMLDivElement>(null);
+
+  // 成品网格列数（由容器宽度动态计算）
+  const [productColumns, setProductColumns] = useState(4);
+
+  useEffect(() => {
+    const el = productsGridRef.current;
+    if (!el) return;
+    const ro = new ResizeObserver(entries => {
+      const width = entries[0].contentRect.width;
+      // 卡片最小 200px + gap 16px (var(--spacing-lg))
+      setProductColumns(Math.max(1, Math.floor((width + 16) / 216)));
+    });
+    ro.observe(el);
+    return () => ro.disconnect();
+  }, []);
+
+  // 草稿列表虚拟滚动（列表项高度约 64px）
+  const draftsVirtualizer = useVirtualizer({
+    count: drafts.length,
+    getScrollElement: () => draftsListRef.current,
+    estimateSize: () => 64,
+    overscan: 5,
+  });
+
+  // 成品网格按行虚拟滚动（仅当数量超过阈值时启用，避免少量数据的开销）
+  const enableProductVirtualization = products.length > 50;
+  const productRowCount = Math.ceil(products.length / productColumns);
+  const productsVirtualizer = useVirtualizer({
+    count: productRowCount,
+    getScrollElement: () => productsGridRef.current,
+    estimateSize: () => 280,
+    overscan: 2,
+  });
+
   const loadProducts = async () => {
     try {
       const result = await invoke('list_local_products') as ApiResponse<ProductItem[]>;
@@ -398,10 +436,38 @@ export default function MyWorks() {
           {activeTab === 'products' && (
             <>
               {products.length > 0 ? (
-                <div className="works-grid">
-                  {products.map(product => (
-                    <ProductCard key={product.path} product={product} onDelete={openDeleteModal} onRename={handleRenameProduct} />
-                  ))}
+                <div ref={productsGridRef} className="works-grid" style={{ overflow: 'auto', flex: 1, minHeight: 0, display: enableProductVirtualization ? 'block' : undefined }}>
+                  {enableProductVirtualization ? (
+                    <div style={{ height: `${productsVirtualizer.getTotalSize()}px`, position: 'relative', width: '100%' }}>
+                      {productsVirtualizer.getVirtualItems().map(virtualRow => {
+                        const startIdx = virtualRow.index * productColumns;
+                        const rowProducts = products.slice(startIdx, startIdx + productColumns);
+                        return (
+                          <div
+                            key={virtualRow.key}
+                            style={{
+                              position: 'absolute',
+                              top: 0,
+                              left: 0,
+                              width: '100%',
+                              height: `${virtualRow.size}px`,
+                              transform: `translateY(${virtualRow.start}px)`,
+                            }}
+                          >
+                            <div style={{ display: 'grid', gridTemplateColumns: `repeat(${productColumns}, 1fr)`, gap: 'var(--spacing-lg)', height: '100%' }}>
+                              {rowProducts.map(product => (
+                                <ProductCard key={product.path} product={product} onDelete={openDeleteModal} onRename={handleRenameProduct} />
+                              ))}
+                            </div>
+                          </div>
+                        );
+                      })}
+                    </div>
+                  ) : (
+                    products.map(product => (
+                      <ProductCard key={product.path} product={product} onDelete={openDeleteModal} onRename={handleRenameProduct} />
+                    ))
+                  )}
                 </div>
               ) : (
                 <div className="empty-state-page">
@@ -415,22 +481,35 @@ export default function MyWorks() {
           )}
           {activeTab === 'drafts' && (
             <>
-              <div className="drafts-list-container">
+              <div ref={draftsListRef} className="drafts-list-container" style={{ overflow: 'auto', flex: 1, minHeight: 0 }}>
                 {drafts.length > 0 ? (
-                  <div className="drafts-list">
-                    {drafts.map(draft => (
-                      <DraftListItem
-                        key={draft.id}
-                        draft={draft}
-                        onClick={handleOpenDraft}
-                        isEditing={editingDraftId === draft.id}
-                        editValue={editDraftTitle}
-                        onEdit={e => handleEditDraft(e, draft)}
-                        onSave={saveDraftTitle}
-                        onChange={setEditDraftTitle}
-                        onDelete={e => openDeleteDraftModal(e, draft)}
-                      />
-                    ))}
+                  <div style={{ height: `${draftsVirtualizer.getTotalSize()}px`, position: 'relative', width: '100%' }}>
+                    {draftsVirtualizer.getVirtualItems().map(virtualItem => {
+                      const draft = drafts[virtualItem.index];
+                      return (
+                        <div
+                          key={virtualItem.key}
+                          style={{
+                            position: 'absolute',
+                            top: 0,
+                            left: 0,
+                            width: '100%',
+                            transform: `translateY(${virtualItem.start}px)`,
+                          }}
+                        >
+                          <DraftListItem
+                            draft={draft}
+                            onClick={handleOpenDraft}
+                            isEditing={editingDraftId === draft.id}
+                            editValue={editDraftTitle}
+                            onEdit={e => handleEditDraft(e, draft)}
+                            onSave={saveDraftTitle}
+                            onChange={setEditDraftTitle}
+                            onDelete={e => openDeleteDraftModal(e, draft)}
+                          />
+                        </div>
+                      );
+                    })}
                   </div>
                 ) : (
                   <div className="empty-state-full">

tauri-app/src/pages/VideoCreation/VoiceSynthesis.tsx

@@ -73,7 +73,8 @@ export default function VoiceSynthesis() {
     () => segments.map(s => s.voiceover?.trim() || '【空镜】').join('\n'),
     [segments]
   );
-  const totalChars = mergedText.length;
+  // 剔除标点和空白，仅统计有效字符（中文、英文、数字）
+  const totalChars = mergedText.replace(/[^\u4e00-\u9fa5a-zA-Z0-9]/g, '').length;
 
   // TTS 预计积分：按 0.25 秒/字（后端配置 seconds_per_char: 0.25），除以语速倍速
   // 加上镜头切换停顿（segment↔empty_shot: 0.5s，同类型: 0.3s），每 5 秒 1 积分，最低 1 积分
@@ -82,7 +83,8 @@ export default function VoiceSynthesis() {
     if (validSegments.length === 0) {return { min: 0, max: 0 };}
 
     // 纯朗读时间（与后端配置 seconds_per_char: 0.25 保持一致）
-    const totalChars = validSegments.reduce((sum, s) => sum + s.voiceover!.trim().length, 0);
+    // 剔除标点和空白，仅统计有效字符
+    const totalChars = validSegments.reduce((sum, s) => sum + s.voiceover!.trim().replace(/[^\u4e00-\u9fa5a-zA-Z0-9]/g, '').length, 0);
     const speechSeconds = (totalChars * 0.25) / (speed || 1);
 
     // 镜头切换停顿时间（与 handleGenerate 中插入 <#x#> 标记的逻辑一致）