iven 32a91551c4
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perf(app): Phase 2 前端性能优化 5 项 — 8b-D01/D02/D03/M02/N01
- 8b-D01: Isar 添加 authorId+dateEpoch 复合索引和 dateEpoch 单独索引
- 8b-D02: getJournals 分页改为 DB 层 .offset().limit() 替代 Dart 层 sublist
- 8b-D03: home_bloc monthCount 改用日期范围独立查询(不受分页限制)
- 8b-M02: 笔画光栅化改为 BBox 裁剪 — 短笔画不再创建全画布尺寸图像
  - _CacheEntry 增加 offset 字段记录 BBox 偏移
  - _rasterizeStroke 计算包围盒 + 4px padding
  - _compositeIncremental 使用 offset 定位
- 8b-N01: SyncEngine enqueue 合并同一资源的操作
  - create+update → create(最新数据)
  - update+update → update(最新数据)
  - update+delete → delete
  - create+delete → 取消(不发送)
- 注意: Isar .g.dart 需运行 build_runner 重新生成
2026-06-03 16:05:11 +08:00
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