docs: add Lemon font build section to README

Describes the font-lemon branch variant with native Unicode rendering,
pixel-accurate word wrap, and a link to the Lemon font source.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Jakub
2026-05-19 14:07:20 +02:00
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## Lemon Font Build
An alternative firmware build is available on the `font-lemon` branch. It replaces the default 5×7 Adafruit font with the [Lemon bitmap font](https://github.com/cmvnd/fonts), which offers:
- **Native Unicode rendering** — Latin Extended, Greek, and Cyrillic characters (U+0020U+04FF) are displayed directly without transliteration, covering Polish, Czech, Slovak, German, French, Scandinavian, Hungarian, Romanian, Croatian, Turkish, Baltic, Russian, and Greek scripts.
- **Pixel-accurate word wrap** — text wraps based on actual glyph widths rather than a fixed character count.
- **Slightly taller glyphs** — the font uses a 10 px line height compared to 8 px for the default font.
Prebuilt `.uf2` files for the Lemon font variant are included in each release alongside the standard builds and are identified by `lemon-font` in the filename.
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Feel free to explore, share feedback and feature requests!
## Development