dangernoodle-io / breadboard / 26202581853

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refactor(bb_display): extract shared SPI helpers + autoregister macro (#290)

Audit findings F11 (SPI bus init duplication), F12 (RGB565 byte-swap blit duplication), F20 (autoregister boilerplate).

- New component `bb_display_spi_common` with `bb_display_spi_init_bus()` and `bb_display_blit_spi()`; consumed by `bb_display_ili9341` and `bb_display_st77xx`.
- Macro `BB_DISPLAY_AUTOREGISTER(chip, kconfig, backend)` replaces the per-driver `__attribute__((constructor))` boilerplate across 5 drivers.
- Single shared bounce buffer eliminates ~1 KB BSS duplication.
- Host test coverage added for bb_display core (clipping, font tables, byte-swap, bounce math).

Memory: ~1 KB BSS recovered; behavior unchanged.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

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