dangernoodle-io / breadboard / 25271064098

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feat(bb_display): set_rotation API + per-backend impls (B1-154) (#192)

adds bb_display_set_rotation(deg) to the public API. core dispatch
validates the angle (0/90/180/270 only), forwards to a new vtable
slot on bb_display_backend_t, and updates s_width/s_height with
post-rotation dimensions returned by the backend. backends that
leave the slot NULL get BB_ERR_INVALID_STATE returned to callers.

per-backend implementations:
- ssd1306 (arduino + esp-idf): 0/180 only, via SEGREMAP (0xA0/0xA1)
  + COMSCAN (0xC0/0xC8) on arduino, mirror() on esp-idf. 90/270
  returns BB_ERR_INVALID_STATE — the page-oriented framebuffer can't
  rotate arbitrarily without a full software transpose.
- ili9341 (arduino + esp-idf): full 0/90/180/270 via MADCTL on
  arduino, esp_lcd_panel_swap_xy + mirror on esp-idf. dimensions
  swap on 90/270.
- st77xx — st7735 + st7789 on both arduino and esp-idf: same MADCTL
  / swap_xy + mirror approach.
- ek79007: set_rotation = NULL. lvgl handles rotation differently;
  out of scope.

371 host tests pass; all six smoke envs build green. bench validation
will land alongside the showcase smoke demo (next PR).

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