Clear light/dark and Tinted light/dark all render from one "tinted"
specialization: the system reads the layer as luminance (white = visible)
and tints it. Without one they fall back to the light layers, whose black
girl and ring have no luminance, so those four modes showed an empty plate.
Point "tinted" at the white layers already used for dark mode; the manifest
test now requires it and pins it to the dark image. Verified in the Dock on
macOS 26.6.2 in Clear and Tinted, light and dark: white girl and ring as
glass / in the tint colour.
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