Add basic responsive styles for button-small and button-large, override responsive button-large styles when used in the .interim-login iframe. Fixes #26363.
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Simplify the color scheme profile saving JS. see #25858.

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Restyle .sub text and .mu-storage header to match new admin design conventions. Fixes #26357.
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Only informally deprecate get_screen_icon() and screen_icon(). fixes #26119.

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