ish1416 354b706e88 fix: include filename and line numbers in CSS parse errors
- Add getLineAndColumn helper to calculate position from buffer index
- Add formatError helper to format errors with source location
- Update all CSS parser error messages to include filename:line:column
- Add comprehensive test coverage for error reporting
- Maintain backward compatibility when no filename provided

Fixes #19236
2025-11-08 13:48:50 +05:30
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