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.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 14.49275% with 59 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.54%. Comparing base (ea238f5) to head (ec12e6f).

Files with missing lines	Patch %	Lines
src/exporter/svg.ts	14.49%	59 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #227      +/-   ##
==========================================
- Coverage   46.62%   46.54%   -0.09%     
==========================================
  Files         342      342              
  Lines       28261    28329      +68     
  Branches     2368     2374       +6     
==========================================
+ Hits        13177    13186       +9     
- Misses      15072    15131      +59     
  Partials       12       12              

Flag	Coverage Δ
infographic	46.54% <14.49%> (-0.09%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/exporter/svg.ts	64.97% <14.49%> (-11.50%)	⬇️

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[Aarebecca]

/gemini review

[gemini-code-assist]

Code Review

This pull request implements automatic viewBox expansion for SVG exports to ensure that content within foreignObject elements is not clipped, particularly when using flexbox alignments like center or flex-end. It also refactors the Infographic component to expose a download method via useImperativeHandle and adds download buttons to the development preview. Feedback focuses on improving the robustness of the overflow detection by using getComputedStyle for alignment, supporting horizontal overflow, and targeting generic child elements within foreignObject instead of specific tags.

[Aarebecca]

/gemini review

[gemini-code-assist]

Code Review

This pull request implements automatic viewBox expansion for SVG exports to capture content overflowing from foreignObject elements, specifically handling various flexbox alignments. It also refactors the Infographic component to expose a download method via a ref and adds export buttons to the development preview. Feedback recommends extending the alignment checks to include modern CSS values like 'end' and 'right' for more robust overflow calculation.