feat(reader,library): PDF 深色模式 + 文献库按论文分文件夹（含迁移）+ 嵌套子专题 + 按范围提问 - #8

feat(reader,library): PDF 深色模式 + 文献库按论文分文件夹（含迁移）+ 嵌套子专题 + 按范围提问#8

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