dangernoodle-io / TaipanMiner / 26888080051

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refactor(led): adopt breadboard bb_led + add mining heartbeat (#492)

TM's led component hand-rolled an APA102 bit-bang (tdongle) and GPIO on/off (S2),
duplicating breadboard's bb_led_* backends. Replace with bb_led: tdongle ->
bb_led_apa102, S2 -> bb_led_pwm (dimmable), bitaxe/wroom32 -> no LED. Drops the
direct esp_driver_gpio dependency and the raw gpio_*/ESP_LOG* leaks; led.c is now
a thin cap-aware adapter (board-specific only in the backend open).

Adds a mining status heartbeat: a slow dim breathe (bb_led_anim BREATHE, 3s,
0-5%) on boards with a status LED, so the headless S2 shows "alive + hashing".
The animator ticks off bb_timer so it stays smooth under single-core mining load.
Power-on shows a 5x ~25% blink. OTA progress (shared bb_ota_progress_cb_t) still
overrides the heartbeat.

validated on hardware: s2 boots (blink) and mines (breathe); a full boot-mode OTA
(POST /api/update/boot -> full-heap TLS pull -> reboot) still works, pulled image
mines ~245 kH/s. tdongle/bitaxe/wroom32 build clean; 494 host tests pass.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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