dangernoodle-io / breadboard / 25270258492

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fix(bb_display): ssd1306 arduino — luma threshold for rgb565→mono (#188)

previous threshold (any non-zero color = pixel on) was too aggressive:
near-black backgrounds like 0x0004 (the splash bg) mapped to ON, so
clear() lit the whole screen and subsequent text blits painted white-
on-white — invisible.

new threshold uses ~50% luma, so:
  0x0000 (black)          → off
  0x0004 (very dark blue) → off
  0xFFFF (white)          → on
  bright colors           → on

validated on the bench: ssd1315 oled wired to r4 wifi via base shield
v2.1 grove i2c — splash now renders white text on black background.

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