The header sits on the always-dark art atmosphere, but its text used Theme.text-* which is dark on a light theme = unreadable. Route the header title/artist/meta/description through hdr-strong/hdr-body colors that go white over the gradient and fall back to the theme colors when the gradient is off; below-divider text is untouched. The atmosphere also faded out above the divider on description-bearing headers — raise its height to 440px and push the fade start to 74% so it reaches the header/track-list divider. Addresses #491/#519.
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