## Summary
Convert TrailingWhitespaceRule to use SwiftSyntax instead of SourceKit
for improved performance and better handling of trailing whitespace
detection, especially within block comments.
## Key Technical Improvements
- **Enhanced block comment detection** distinguishing between lines fully
covered by block comments vs lines containing block comments with code
- **Accurate whitespace detection** using CharacterSet.whitespaces for
all Unicode whitespace characters, not just space and tab
- **Improved comment handling** with proper detection of line-ending
comments and multi-line block comment structures
- **Better correction mechanism** using ViolationCorrection ranges
instead of manual string reconstruction
- **Line-based analysis** maintaining efficiency while providing precise
violation positions
## Migration Details
- Replaced `CorrectableRule` with `@SwiftSyntaxRule(correctable: true)`
- Implemented `ViolationsSyntaxVisitor` pattern for line-based validation
- Added `collectLinesFullyCoveredByBlockComments` to properly handle
test framework comment wrapping scenarios
- Distinguished between three comment scenarios: lines fully within block
comments, full-line comments, and lines ending with comments
- Maintained all configuration options (ignores_empty_lines, ignores_comments)
- Preserved exact violation position reporting with UTF-8 offset calculations
Danny Mösch
Nandhini Subramani
JP Simard