fix: add error logging for code highlighting failures

[hobostay]

Summary

Add error logging for Shiki code highlighting failures to help debug language-specific issues.

Changes

• ChatMarkdown.tsx: Log highlighting failures while still falling back to plain text

Co-Authored-By: Claude Opus 4.6 noreply@anthropic.com

Note

Add error logging for code highlighting failures in SuspenseShikiCodeBlock

• Captures the caught error in the SuspenseShikiCodeBlock catch block by changing catch {} to catch (error) {} in ChatMarkdown.tsx.
• Adds a console.warn call to log the language and error on highlight failure.
• Risk: The console.warn and referenced identifiers (language, error) are placed outside any valid scope in the current diff, which will cause a build/parse failure for the module.

^{Macroscope summarized 6488ae4.}

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