fix: fix Latex BuildException

[M-T-Arden]

PR Checklist

• My code adheres to [AppFlowy's Conventions](https://docs.appflowy.io/docs/documentation/software-contributions/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

Bug Fixes:

• Fixes a BuildException that occurs when importing LaTeX equations containing raw \\ line breaks from external sources (e.g., Notion). This fix introduces a preprocessing step that wraps such input in an aligned environment, preventing CrNode exceptions without modifying the math rendering library.
• Related to [Bug] Latex rendering error #7949

Summary by Sourcery

Prevent BuildException when rendering LaTeX equations containing raw '\' by wrapping them in an 'aligned' environment using a new preprocessing step.

Bug Fixes:

• Prevent BuildException when importing LaTeX formulas with raw '\' line breaks by wrapping them in an 'aligned' environment if not already wrapped.

Enhancements:

• Introduce a _safeLatex preprocessing function to wrap raw line breaks in an aligned environment before rendering.

[sourcery-ai]

Reviewer's Guide

Introduces a preprocessing step in the MathEquationBlockComponentWidgetState to wrap imported LaTeX containing raw "\" line breaks in an aligned environment, preventing BuildException errors without altering the underlying rendering library.

Sequence Diagram for LaTeX Preprocessing within _buildMathEquation

sequenceDiagram
    participant BME as _buildMathEquation
    participant SL as _safeLatex
    participant Renderer as Math.tex

    BME->>SL: _safeLatex(formula)
    activate SL
    alt formula contains literal '\\\\' AND no literal '\\begin{'
        SL->>SL: newFormula = "\\begin{aligned}" + formula + "\\end{aligned}"
        SL-->>BME: newFormula
    else formula is safe OR has existing environment
        SL-->>BME: formula (unchanged)
    end
    deactivate SL
    BME->>Renderer: tex(processedFormula)
    activate Renderer
    Renderer-->>BME: RenderedOutput
    deactivate Renderer

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Updated Class Diagram for MathEquationBlockComponentWidgetState

classDiagram
    class MathEquationBlockComponentWidgetState {
        +Widget _buildMathEquation(BuildContext context)
        -_safeLatex(String raw) String
    }

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File-Level Changes

Change	Details	Files
Preprocess LaTeX formulas containing raw line breaks by wrapping them in an aligned environment	Added private _safeLatex(raw) helper: if raw contains "\" and no existing "\begin", wraps it in "\begin{aligned}…\end{aligned}" Replaced direct use of formula with _safeLatex(formula) when calling Math.tex	frontend/appflowy_flutter/lib/plugins/document/presentation/editor_plugins/math_equation/math_equation_block_component.dart

Possibly linked issues

• [Bug] Latex rendering error #7949: The PR fixes the BuildException and CrNode error when rendering Latex with raw \ line breaks by wrapping the input in an aligned environment.

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[CLAassistant]

All committers have signed the CLA.

[sourcery-ai]

Hey @M-T-Arden - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟡 General issues: 1 issue found
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[M-T-Arden]

After fixing the LaTeX BuildException, the default right alignment for overflowed formulas may not meet users' needs. I adjusted this to left alignment (see the latest commit).