mod: Phase 2a - add mod settings, I18n strings, and main.cpp integration
CrossPointSettings: Add mod-specific enums and fields:
- Clock: CLOCK_FORMAT, CLOCK_SIZE, TIMEZONE, clockFormat, clockSize,
timezone, timezoneOffsetHours, autoNtpSync
- Sleep: SLEEP_SCREEN_LETTERBOX_FILL, sleepScreenLetterboxFill
- Reader: preferredPortrait, preferredLandscape
- Indexing: INDEXING_DISPLAY, indexingDisplay
- getTimezonePosixStr() for POSIX TZ string generation
main.cpp: Integrate mod initialization:
- OPDS store loading, boot NTP sync, timezone application
- Clock refresh loop (re-render on minute change)
- RTC time logging on boot
SettingsList.h: Add clock, timezone, and letterbox fill settings
JsonSettingsIO.cpp: Handle int8_t timezoneOffsetHours separately
I18n: Add ~80 mod string keys (english.yaml + regenerated I18nKeys.h)
Made-with: Cursor
66a754dabd
