feat: improve font resolver

[PeterStaar-IBM]

Summary

Improve Blend2D renderer font resolution by replacing path-only, fuzzy-first system font matching with deterministic metadata-based resolution.

This change adds a richer font resolver that indexes actual font face metadata, supports .ttc face indexes, handles Standard 14 / URW / TeX aliases, and isolates macOS,
Windows, and Linux font discovery behind platform helpers.

Before

After

Details

• Index system fonts by Blend2D face metadata:
  • family name
  • full name
  • subfamily name
  • PostScript name
  • weight
  • style
  • path + face index
• Support TrueType/OpenType collections by iterating BLFontData::face_count().
• Cache loaded BLFontFace objects by {path, face_index}.
• Resolve fonts in a deterministic order before fuzzy matching:
  • subset-prefix stripping
  • normalization
  • explicit aliases
  • exact metadata lookup
  • style selection
  • TeX fallback families
  • fuzzy matching as last resort
  • OS fallback font
• Add aliases for:
  • PDF Standard 14 fonts
  • URW/Ghostscript fonts such as Nimbus families
  • common TeX/Computer Modern and Latin Modern families
• Add platform-specific font directory and fallback handling for:
  • macOS
  • Windows
  • Linux
• Keep actual font face loading lazy; font faces are only loaded after a match is selected.

Notes

This improves substitution quality and cross-platform behavior, but it does not yet render embedded PDF font programs. Specialized subset fonts such as CMTT10, CMSY7,
and CMEX10 can still require embedded font support for fully faithful output.

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