dangernoodle-io / breadboard / 26205881106

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refactor(bb_display): heap-alloc framebuffer, gate fonts, reuse bounce buffer (#297)

- ssd1306 framebuffer (espidf + arduino): convert static uint8_t s_fb[1024]
  to heap pointer allocated in init via heap_caps_malloc/malloc; returns
  BB_ERR_NO_MEM on alloc failure; saves 1024 B BSS on firmwares that link
  the component but never call init (e.g. runtime-probe builds that select a
  different display)
- per-font Kconfigs (bb_display): add CONFIG_BB_DISPLAY_FONT_{5X8,6X12,8X16}
  (all default y for back-compat); gate CMakeLists source inclusion and header
  externs on the flags; saves up to 3420 B flash rodata when unused fonts are
  disabled (760 B + 1140 B + 1520 B)
- ili9341 clear path: remove static uint16_t s_line[320] (640 B BSS); delegate
  to new bb_display_clear_spi() helper in bb_display_spi_common that fills the
  shared 512-pixel bounce buffer once and blits row-by-row; saves 640 B BSS

back-compat: all Kconfigs default y; existing consumers see identical behavior

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

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