External Status LED with Breathing Patterns

[t0mg]

I have implemented a new StatusLED class that provides PWM control for an external monochrome LED. This class supports complex breathing patterns defined by four phases: off, fade-in, on, and fade-out, as requested.

I've integrated this into the main application logic:

• Fast blink during initial boot.
• Specific breathing patterns for WiFi Station and AP modes.
• Blink when the SD card is detected.
• Slow breathing during video/image playback and a solid dim light when paused.

The hardware pin is configurable via the STATUS_LED_PIN macro in platformio.ini, which I've defaulted to GPIO 14. I also ensured that the PWM channel (1) does not conflict with the display backlight (0).

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PR created automatically by Jules for task 9036901767817280568 started by @t0mg

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