Rework the 160x80 status screen: large predicted-weather icon in the
right window (scaled to fill), Wi-Fi/IP line at the bottom (or 'offline'),
colour-coded forecast category, and the trend arrow shown only when
rising/falling. Colours are built R/B-swapped for this BGR ST7735S panel.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>