breaking(ImageViewer): 补齐图片预览缩放与关闭交互 - #1091
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🤔 这个 PR 的性质是？
🔗 相关 Issue
Related #1027
💡 需求背景和解决方案
ImageViewer 公开 Demo 收敛为“基础图片预览”和“带操作图片预览”两个入口，并补齐不透明预览背景、操作栏尺寸与页码样式。
保持
TImageViewer.show现有参数不变：支持横向切图、单击关闭、下拉关闭、双击 1x/2x、双指 1～3x 缩放；放大时暂停分页。onClose统一覆盖按钮、单击、下拉及系统返回，且只通知一次；onDelete仍只通知索引。设计及操作结果由 4 张固定 Linux Flutter 3.32 Golden 覆盖：Demo light/dark、真实点击打开带操作面板 light/dark。详细契约和验证记录见
specs/035-image-viewer-design-alignment/。📝 更新日志
breaking(ImageViewer): 单击图片现在会在触发
onTap后关闭预览，并统一触发一次onClosefeat(ImageViewer): 支持双击、双指缩放和下拉关闭，优化操作栏与预览背景
本条 PR 不需要纳入 Changelog
☑️ 请求合并前的自查清单
type(<scope>?): 修改描述。示例：
fix(TBottomTabBar): 修复 iconText 模式底部溢出