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Fraction of the Android adaptive-icon canvas (108dp) that the foreground is scaled to. The FG is centred on a transparent canvas at this size, so smaller values mean more padding and less chance of the launcher's mask clipping corners.
Default 66.0 / 108.0 (~0.611), matching Android's adaptive-icon safe zone. Lower this (typically 0.55–0.6) for tighter OEM/third-party masks. Validated at configuration and execution: must be in (0, 1] so the requested safe zone cannot crop outside the adaptive-icon canvas.