- Refactored file reading logic to process bytes directly instead of decoding entire chunks into strings, improving memory efficiency and enabling better line boundary detection.
- Restructured line collection state management with dedicated helper functions (setupLineState, appendSegment, finalizeLine, decodeLine) for clearer control flow and byte tracking.
- Enhanced byte limit tracking to accurately count selected lines and bytes separately, fixing calculation of truncation metadata.
- Added firstLinePreview and firstLineByteLength fields to streamLinesFromFile return type to support better handling of oversized first lines.
- Improved firstLineExceedsLimit detection to use actual byte length instead of relying on empty collection state.
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