chore(firmware): bump submodule to LED-ported firmware (39c4ef319)
Adds CMD_LED_CONTROL (0x011B): payload_led_control_t + PWM/effect helpers + appmain dispatch, on top of the rebased 5530c1269. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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