Adds LED indicators for startup and capture#5
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Implements visual feedback using the NeoPixel for key system events. A green blink sequence confirms successful device startup, providing a clear initialization signal. A white blink sequence is triggered when the capture button (`KEY_ENTER`) is pressed, signaling that a photo has been taken. This uses an atomic flag (`sig_atomic_t`) for safe inter-thread communication, ensuring responsiveness without disrupting ongoing animations.
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Introduces visual feedback for key system events:
KEY_ENTERbutton is pressed to confirm a photograph has been taken.These indicators enhance user experience by providing clear visual cues for system status and actions. The implementation includes a new
color_blinkutility function and uses asig_atomic_tflag for robust inter-thread communication between the button handling and LED animation threads. TheREADME.mdand internal code documentation have been updated to reflect these new features.