cottongin 30473c27d3 mod: Phase 2c-e — GfxRenderer, themes, SleepActivity, SettingsActivity, platformio ...

- Add drawPixelGray to GfxRenderer for letterbox fill rendering
- Add PRERENDER_THUMB_HEIGHTS to UITheme for placeholder cover generation
- Add [env:mod] build environment to platformio.ini
- Implement sleep screen letterbox fill (solid/dithered) with edge
  caching in SleepActivity, including placeholder cover fallback
- Add Clock settings category to SettingsActivity with timezone,
  NTP sync, and set-time actions; replace CalibreSettings with
  OpdsServerListActivity; add DynamicEnum rendering support
- Add long-press book management to RecentBooksActivity

Made-with: Cursor

2026-03-07 15:52:46 -05:00

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