What technical benefit does focus peaking provide in a third-party camera app that enables critical sharpness in near-dark conditions where autofocus typically fails?

Autofocus (AF) systems, particularly contrast-detection AF common in many cameras, determine focus by analyzing the differences in light intensity, or contrast, across the image sensor. In near-dark conditions, there is insufficient light for the sensor to capture strong contrast information. The resulting weak and noisy signal makes it difficult for the AF algorithm to accurately identify sharp edges, causing it to "hunt" (move the lens back and forth trying to find focus) or fail to lock focus. Focus peaking provides a technical solution by visually highlighting areas of the live view feed that are in sharp focus, enabling precise manual focusing. Th....