[0129] 优化 PDF 缩放性能：页面缓存、可见性裁剪与防抖#3371
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参考 Okular Tile-based 渲染架构，引入以下优化： - 页面渲染缓存：以 (pageNumber, targetWidth) 为键缓存 QPixmap - 可见性裁剪：rebuildPages 只渲染视口 ±200px 范围内的页面 - 缩放防抖：Ctrl+滚轮缩放后 200ms 防抖，避免连续触发重渲染 - Resize 防抖：窗口大小调整 300ms 防抖后统一重建 - 滚动按需渲染：垂直滚动时自动触发新进入视口页面的渲染 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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Summary
PDFReaderWidget进行缩放性能优化核心改动
PdfPageCacheKey+QHash)：以(pageNumber, targetWidth)为键缓存QPixmap，相同尺寸页面直接命中，跳过 MuPDF 光栅化rebuildPages()只渲染视口 ±200px 范围内的页面；不可见页面若缓存存在则显示降级缩放图zoomDebounceTimer_, 200ms)：Ctrl+滚轮连续缩放时只渲染最终状态resizeDebounceTimer_, 300ms)：窗口大小调整后防抖统一重建valueChanged连接rebuildPages()，新进入视口的页面自动渲染loadFromFile()时一次性读取所有页面的宽高比，避免重复打开文档Test plan
xmake build stem通过xmake run qt_pdf_reader_widget_test10 passed, 0 failed🤖 Generated with Claude Code