Fix MathML rendering

[akhuoa]

Fixes #78 and #126.

Problem

• MathJax: MathJax becomes performance‑intensive when rendering large volumes of equations.
• KaTeX: The mathematics content we have is in MathML, but KaTeX accepts only TeX as input.
• Default: Browsers support MathML, but rendering is incomplete because some MathML elements (e.g., mfence) are deprecated.

Solution

Fix MathML rendering using w3c/mathml-polyfills instead of using MathJax or KaTeX.

• Additionally, the mathematical equations are styled in middle alignment for better readability.

Testing

Before the update

• https://physiome.github.io/pmrapp-frontend/exposures/5f1/Tomek_model_endo.cellml/cellml_math

After the update

• https://akhuoa.github.io/pmrapp-frontend/exposures/5f1/Tomek_model_endo.cellml/cellml_math
• https://akhuoa.github.io/pmrapp-frontend/exposures/5a0/ohara_rudy_cipa_v1_2017.cellml/cellml_math

Note: There are empty content filters applied from #148.

[Copilot]

Pull request overview

This PR addresses broken/incomplete MathML rendering in the Mathematics view by switching from MathJax/KaTeX approaches to using the W3C MathML polyfills, and applying formatting/styling to improve equation readability.

Changes:

• Added a MathML transformer utility to load/apply W3C MathML polyfills and reformat MathML into an aligned table layout.
• Updated the Exposure detail Mathematics view to initialize polyfills, transform/format MathML from math.json, and display an empty-state message.
• Refined Mathematics view styling for centered, aligned equation rendering.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 7 comments.

File	Description
src/utils/mathTransformer.ts	Loads polyfills, transforms legacy MathML, and formats MathML into an mtable-based layout.
src/components/organisms/ExposureDetail.vue	Integrates MathML transformation into the math view and updates math rendering styles/empty state.

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