Fix xcancel and bcancel not rendering

[thomaskrabichler]

Problem

\xcancel and \bcancel commands don't render correctly.

Cause

Two bugs:

1. Typo in enclosure.dart (line 98)
   'downdiagnoalstrike' should be 'downdiagonalstrike'

2. Array syntax in enclose.dart (line 91)
   ['updiagonalstrike, downdiagonalstrike'] - comma is inside the string
   Should be: ['updiagonalstrike', 'downdiagonalstrike'] - two separate elements

Result

• \bcancel now draws the correct diagonal
• \xcancel now draws both diagonals

[CLAassistant]

All committers have signed the CLA.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: f6398ae0-9ae6-4e0f-ad9e-967f44efb32b

📥 Commits

Reviewing files that changed from the base of the PR and between 2f270ae and 98d7721.

📒 Files selected for processing (2)

• lib/src/ast/nodes/enclosure.dart
• lib/src/parser/tex/functions/katex_base/enclose.dart

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📝 Walkthrough

Walkthrough

Two bug fixes related to mathematical notation handling in the LaTeX parser: correcting a typo in diagonal strike notation detection and restructuring the \xcancel strike mapping from a combined string to separate entries.

Changes

Cohort / File(s)	Summary
Enclosure notation fixes lib/src/ast/nodes/enclosure.dart	Fixed typo in enclosure notation check from 'downdiagnoalstrike' to 'downdiagonalstrike' to correctly gate the diagonal strike rendering branch.
Cancel function notation mapping lib/src/parser/tex/functions/katex_base/enclose.dart	Separated \xcancel strike notation mapping from a single combined string 'updiagonalstrike, downdiagonalstrike' into two distinct entries for proper parsing.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Fix xcancel and bcancel not rendering' directly summarizes the main objective of the PR: fixing rendering issues with the \xcancel and \bcancel LaTeX commands.
Description check	✅ Passed	The description clearly explains the problem (rendering issues with \xcancel and \bcancel), identifies two specific bugs with line numbers and code examples, and explains the expected results after fixes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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