dangernoodle-io / breadboard / 25264745780

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feat(bb_display): backend registry + layered blit/text API (B1-132) (#179)

split bb_display into a panel-agnostic core + per-chip backend
components. core ships pixel-buffer primitives (clear / blit /
flush) plus optional layered helpers (draw_text, show_splash,
show_prov) with a swappable bb_display_font_t (default 8x16
ascii bitmap, vendored from taipanminer).

backends register a bb_display_backend_t via a constructor at
link time; bb_display_init picks the registered backend and
caches its native dimensions. backends optionally provide a
native draw_text (lvgl uses lv_label); when null, the core
rasterizes via the active font and the backend's blit.

ek79007 + lvgl + esp_lcd_ek79007 + esp_lvgl_port deps move out of
bb_display into a new bb_display_ek79007 component. snugfeather's
lvgl escape hatch (lock/unlock/screen) moves to the new
bb_display_ek79007.h.

headless smoke envs (esp32, esp32c3, tdongle) drop bb_display
from their REQUIRES entirely; the smoke top-level CMakeLists
EXCLUDE_COMPONENTS bb_display_ek79007 only because the example
auto-scans every component dir and the ek79007 managed component
is p4-only.

pr2 (B1-133, st77xx) and pr3 (B1-134, ssd1306) follow; tm
display retirement waits for pr3 + tag.

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