New Update math_equation_block_component.dart

[Aathish101]

Feature Preview

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PR Checklist

• My code adheres to AppFlowy's Conventions
• I've listed at least one issue that this PR fixes in the description above.
• I've added a test(s) to validate changes in this PR, or this PR only contains semantic changes.
• All existing tests are passing.

Summary by Sourcery

Enable multiline LaTeX rendering in the math equation block via a new preprocessing function and clean up component implementation.

New Features:

• Add safeLatex method to transform formulas with '\' into aligned LaTeX environment for multiline support

Enhancements:

• Use safeLatex when rendering equations in Math.tex
• Remove redundant blank lines and simplify component code formatting

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[sourcery-ai]

Hey there - I've reviewed your changes - here's some feedback:

• Remove the stray “Expand Down”/“Expand Up” text that was accidentally inserted into the widget build methods so the code compiles and the UI layout remains clear.
• Consider extracting the safeLatex method out of the widget state into a standalone utility or String extension to keep the component focused on UI and improve testability.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Remove the stray “Expand Down”/“Expand Up” text that was accidentally inserted into the widget build methods so the code compiles and the UI layout remains clear.
- Consider extracting the safeLatex method out of the widget state into a standalone utility or String extension to keep the component focused on UI and improve testability.

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[LucasXu0]

Please verify the code before submitting a PR.