refactor: extract hardcoded CDN URLs into constants file

[Krshm10]

Description

Extracted 3 hardcoded CDN URLs (latex.js ,base.css, article.css, and KaTeX CSS) from LatexHtmlPreview.tsx into a new constants file at frontend/src/lib/cdnUrls.ts . This makes future library version updates a one-line change instead of requiring edits inside component code.

Fixes #8

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactoring / Code cleanup (no functional changes)
• Documentation update

Testing and Verification

• I have ran the local development environment (./scripts/dev.sh) and verified my changes manually.
• I have verified that all TypeScript compilations pass without errors: npm run build or npx tsc --noEmit.
• I have run the linting suite locally: npm run lint.
• (If applicable) I have verified that the LaTeX compilation worker builds and runs successfully in Docker.

Screenshots / Code Diffs (if applicable)

Not applicable. This is a refactoring change with no UI or functional impact.

Checklist

• My code follows the contributing guidelines of this project.
• I have updated the documentation / README if necessary.
• My changes do not generate new compiler or linter warnings.
• I have added comments to my code, particularly in hard-to-understand areas.

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Project	Deployment	Actions	Updated (UTC)
glyph-frontend	Ready	Preview	Aug 5, 2026 3:45am