fix(LEMS-2617): Require $ to display TeX in axis labels

[anakaren-rojas]

Summary:

• Requires use of $ to render TeX by using the replaceOutsideTeX function.
• Adds test to validate that both TeX and text are being rendered

Issue: LEMS-2617

Test plan:

1. Navigate to Chromatic
2. In the x Label or y Label inputs under Common Graph Settings , add a fraction 1/2 and then replace with $\frac{1}{2}$

Expected Results

a. 1/2 renders as text
b. $\frac{1}{2}$ renders as TeX

Screen recording

Comparison with current functionality and updated functionality using original reported bug text
https://github.com/user-attachments/assets/aeea74d3-70f4-417a-8a52-012a12a29e88

[github-actions]

Size Change: -179 B (-0.01%)

Total Size: 1.29 MB

Filename	Size	Change
packages/perseus-editor/dist/es/index.js	699 kB	-71 B (-0.01%)
packages/perseus/dist/es/index.js	420 kB	-108 B (-0.03%)

ℹ️ View Unchanged

Filename	Size
packages/kas/dist/es/index.js	38.9 kB
packages/keypad-context/dist/es/index.js	760 B
packages/kmath/dist/es/index.js	4.27 kB
packages/math-input/dist/es/index.js	77.8 kB
packages/math-input/dist/es/strings.js	1.79 kB
packages/perseus-core/dist/es/index.js	1.48 kB
packages/perseus-linter/dist/es/index.js	22.2 kB
packages/perseus/dist/es/strings.js	3.55 kB
packages/pure-markdown/dist/es/index.js	3.66 kB
packages/simple-markdown/dist/es/index.js	12.4 kB

_{compressed-size-action}

[github-actions]

npm Snapshot: Published

Good news!! We've packaged up the latest commit from this PR (902a4a0) and published it to npm. You
can install it using the tag PR1865.

Example:

yarn add @khanacademy/perseus@PR1865

If you are working in Khan Academy's webapp, you can run:

./dev/tools/bump_perseus_version.sh -t PR1865

[khan-actions-bot]

Gerald

Required Reviewers

• @Khan/perseus for changes to .changeset/heavy-eels-agree.md, packages/perseus/src/widgets/interactive-graphs/mafs-graph.test.tsx, packages/perseus/src/widgets/interactive-graphs/backgrounds/axis-labels.tsx

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[benchristel]

LGTM! I left a suggestion for testing inline.