The #74 seeded on-now-next.yml never rendered at transcode time:
- format_datetime was called with 2 args; it needs 3 (DateTimeOffset, timeZoneId,
format) and does the tz conversion itself, so the Scriban render threw. Drop the
NEXT start-time (avoids hardcoding a timezone in a shipped default).
- styles had no font_family; CustomFontMapper.TypefaceFromStyle crashes on a null
family before its default-font fallback. Add font_family: Noto Sans.
Verified live on ersatztv-test via frame capture. Adds a seeder test that
deserializes the YAML and asserts base_style resolves + every style sets a font.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>