Add SCREEN_DIM_15 (Off / 100 / 50 / 30 / 15). The value now needs 3 bits, so
repurpose the spare BIT_UNUSED_2 as BIT_SCREEN_DIM_2; existing codeplugs (bit 2
clear) keep their level, no reset.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Shift the contact/TG, CTCSS/DCS and squelch info lines down by a tunable
DISPLAY_MAIN_CONTENT_TOP_PAD (4px) on MD-UV380/DM1701, so they no longer sit
flush against the new S-meter label row. Frequency and everything below are
unchanged.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
