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feat(bb_display): arduino st77xx backend (B1-142) (#186)

arduino sibling of the esp-idf st77xx backend (#181). direct
spi — no adafruit_st77xx dep. two sub-backends in one .cpp:

- st7735: full vendor-init overlay (gamma/power/frame) lifted
  verbatim from platform/espidf/bb_display_st77xx/bb_display_st7735.c,
  adapted to arduino spi with dc-pin command/data control. needed
  for the lilygo t-dongle s3 panel that the esp-idf backend was
  written against.
- st7789: generic init, no overlay.

variant selection via build flags (no kconfig on arduino):
-DBB_DISPLAY_ST77XX_VARIANT_ST7735 (default), VARIANT_ST7789, or
REGISTER_BOTH for cohabiting both. probe=NULL on both — most
arduino boards don't wire miso (matches the esp-idf backend's
behavior); ili9341 with its rddid probe wins first when stacked.

framebuffer-free: blit pushes pixels straight through the spi
bus via 256-pixel byte-swap bounce buffer.

r4_wifis3 smoke env wires it; flash on r4 grew 76.6 → 77.8 kb
(+1.2 kb). 371 host tests pass; all six smoke envs build green.

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