Fixes #5139: Improve YAML error line number extraction for .roomodes files

[roomote]

Summary

This PR fixes issue #5139 where users were experiencing YAML parsing errors in .roomodes files after updating to v3.22.0, specifically addressing problems with line number extraction from YAML error messages.

Problem

Users reported getting generic error messages like:

Invalid YAML format on line 7 of the .roomodes file. Please check: • Correct indentation (use spaces, not tabs) • Matching quotes and brackets • Valid YAML syntax

The issue was that the line number extraction logic in CustomModesManager was only looking for one specific error message format pattern, but the YAML library can produce different error message formats.

Solution

Enhanced the line number extraction logic in src/core/config/CustomModesManager.ts to handle multiple YAML error message formats:

• at line X - Original pattern
• line X - Alternative pattern
• (line:column) - Parenthesized format
• line:column - Direct format

The fix tries multiple regex patterns in order and uses the first match found, falling back to 'unknown' if no line number can be extracted.

Changes

• Improved parseYamlSafely() method in CustomModesManager to use multiple line number extraction patterns
• Maintains backward compatibility with existing error handling
• Ensures robust error reporting for .roomodes files with YAML syntax errors

Testing

• Verified that the enhanced regex patterns correctly extract line numbers from various YAML error message formats
• Confirmed that existing functionality remains unchanged
• All linting and type checking passes

Fixes #5139

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Important

Improves line number extraction from YAML error messages in CustomModesManager.ts to handle multiple formats for better error reporting in .roomodes files.

• Behavior:
  • Enhanced line number extraction in parseYamlSafely() in CustomModesManager.ts to handle multiple YAML error message formats.
  • Supports patterns: at line X, line X, (line:column), and line:column.
  • Falls back to 'unknown' if no line number is extracted.
• Testing:
  • Verified regex patterns extract line numbers from various YAML error formats.
  • Confirmed no changes to existing functionality.
  • All linting and type checks pass.

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[delve-auditor]

✅ No security or compliance issues detected. Reviewed everything up to 445cd63.

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