Arabic locale bundle for Trail Mate.

Includes:
- ar-naskh font (Noto Naskh Arabic, 16px, 2bpp)
  Covers Arabic core (0600-06FF), Supplement (0750-077F),
  Presentation Forms-A (FB50-FDFF) and Forms-B (FE70-FEFF)
  for correct contextual letter shaping without HarfBuzz.
- Arabic translations (ar locale)
- RTL direction support (direction=rtl in manifest)
- Display-only review status; Arabic input is not implemented yet

Font dependency: tools/fonts/NotoNaskhArabic-Regular.otf
