shahondin1624 ab91ad2db6 feat: support custom font files for song titles (Closes #4) ...

- Improve PdfFontMetrics: use canonical path for cache key, validate
  font file existence, use absolute paths for BaseFont.createFont
- Add font file path resolution in SongbookPipeline (relative to
  project directory)
- Add font file existence validation in Validator.validateConfig
- Add end-to-end tests: custom font loading, umlaut rendering,
  cache deduplication, missing file error
- Document custom font file usage in example songbook.yaml

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-03-17 09:54:15 +01:00

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