Rework math text editing to normalize user input to LaTeX

[shreekardittakavi]

Summary

Implements #58.

• Add shared LaTeX normalization for common typed math symbols, superscripts/subscripts, inline math, and display math.
• Route quiz and flashcard markdown display through a shared KaTeX-backed LatexMarkdown renderer.
• Normalize user-edited quiz and flashcard math on blur and again before save/evaluation payloads.
• Normalize note MathLive blocks, note block conversion to math, and imported markdown inline/display math before storage.
• Detect LaTeX regions in note rich-text blocks and promote display/standalone regions into real note math blocks on editor load, autosave, paste/import, and API persistence.
• Keep single-dollar $...$ and \(...\) note math inline using the existing note-inline-math span format.
• Add accessible labels for study library action menu triggers used by the updated tests.

Verification

• pnpm test lib/notes/math-regions.test.ts lib/notes/parse-markdown.test.ts lib/notes/markdown.test.ts lib/notes/persistence.test.ts components/note-editor/note-editor.test.tsx
• pnpm lint passes with one existing warning in components/note-editor/code-block-view.tsx
• pnpm test
• pnpm build

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Project	Deployment	Actions	Updated (UTC)
task-master	Ready	Preview, Comment	Jun 10, 2026 5:32am