Maintenance
- Enforced 150-character line length across Go code, excluding raw string literals.
- Simplified PDF helper APIs by removing pass-through wrappers and shortening verbose helper names.
- Modernized convert/pdf code based on gopls hint diagnostics.
- Replaced custom slice cloning helpers with slices.Clone.
- Cleaned up unused parameters and minor inefficient string-building patterns.
Full Changelog: v1.4.2...v1.4.3