fix(exporter): ensure PNG/SVG export covers all foreignObject text

[rnb-tron]

fix #226

[gemini-code-assist]

Summary of Changes

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This pull request enhances the SVG export functionality to correctly handle text within foreignObject elements that may overflow due to flex alignment. It introduces a mechanism to compute and apply a new viewBox that encompasses all text content, ensuring complete and accurate rendering in exported PNG/SVG images.

Highlights

• Foreign Object Text Coverage: Ensures that PNG/SVG export covers all foreignObject text, addressing issue [ Live Editor ]编辑器模块中,复制或下载的PNG中,部分文本展示不全 #226.
• ViewBox Computation: Implements a computeFullViewBox function to calculate a viewBox that fully covers all foreignObject text content, accounting for overflow caused by flex alignment.
• Dynamic ViewBox Adjustment: Dynamically adjusts the SVG's viewBox attribute during export to accommodate potentially overflowing text content within foreignObject elements.

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[gemini-code-assist]

Code Review

This pull request adds functionality to correctly calculate the viewBox for SVG exports to include all text content within foreignObject elements, preventing it from being cut off. The approach is sound. I have a couple of suggestions to enhance the robustness and maintainability of the new code.