dangernoodle-io / breadboard / 25270865280

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feat(bb_display): set_default_font API + vendor 5x7 + 6x8 fonts (B1-155) (#191)

adds bb_display_set_default_font(font) to the public API. lets
consumers swap the fallback font used when callers pass NULL to
draw_text / show_splash / show_prov. NULL arg restores the compile-
time default.

vendors two new fonts alongside the existing 8x16:
- bb_display_font_5x7: adafruit_gfx glcdfont (BSD), transposed from
  column-major to row-major MSB-first to match the existing rasterizer
  layout. fits ~25 chars x 9 lines on 128x64.
- bb_display_font_6x8: cp437 8x8 truncated to 6 columns (public domain).
  fits ~21 chars x 8 lines on 128x64.

each font is compile-out-able for flash-tight arduino targets via
-DBB_DISPLAY_FONT_5X7=0 (etc). fallback chain when the chosen default
is compiled out: 8x16 -> 6x8 -> 5x7 -> NULL (no text). esp-idf
kconfig integration deferred — fonts always linked on idf today,
costs ~1.4 kb of flash for 5x7 + 6x8 combined.

bench-validated all three fonts on the r4 + ssd1315 oled. 371 host
tests pass; all smoke envs build green.

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