fix: reset dendrogram implement

[Aarebecca]

• 将 dendrogram 的包裹节点高度恢复为 0，保持旧版仅依赖 nodeSep/subTreeSep 的布局行为，避免节点尺寸引入的间距偏移。
• 更新所有 dendrogram 相关 SVG 快照，确保升级后结果与旧版一致。
• 保留版本号升级改动用于发版。
• 备注：后续可考虑引入基于 node.height/width 的尺寸感知布局，并同步调整间距/居中逻辑（当前 nodeSize 仍未参与计算）。

[gemini-code-assist]

Summary of Changes

Hello @Aarebecca, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

此拉取请求旨在修复 dendrogram 布局中的一个间距问题，该问题是由于节点尺寸意外地影响了布局计算而引起的。通过将包裹节点的高度重置为 0，我们确保了布局行为回到了仅依赖于 nodeSep 和 subTreeSep 的状态，从而消除了不必要的间距偏移。同时，更新了相关的 SVG 快照以验证此修复，并为即将发布的版本进行了版本号升级。未来可能会考虑引入更智能的尺寸感知布局。

Highlights

• 修复树状图布局: 将 dendrogram 包裹节点的高度重置为 0，以恢复旧版仅依赖 nodeSep/subTreeSep 的布局行为，从而避免了节点尺寸引入的间距偏移问题。
• 更新快照: 更新了所有 dendrogram 相关的 SVG 快照，以确保在布局逻辑调整后，视觉效果与旧版本保持一致。
• 版本升级: 将 package.json 中的版本号从 0.7.0 升级到 0.7.1，为发布新版本做准备。

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[gemini-code-assist]

Code Review

你好，感谢你的贡献。这个 PR 通过将 dendrogram 布局中包裹节点的高度重置为 0，成功修复了因节点尺寸导致的间距偏移问题，恢复了旧的布局行为。代码改动很直接，相关的快照测试也已更新，版本号也已准备好发布。这是一个很好的修复。我只在代码中添加了一个建议，希望能提高代码的可维护性。