Edit Agency configuration properties

Chart colors, always the 13 of them (Metricool defaults where not customized).

Optional white-label theme colors. Each field accepts a hex color (#RGB/#RRGGBB, alpha variants #RGBA/#RRGGBBAA included) or the literal 'transparent'. A field left null/blank falls back to the Metricool default when the color has never been customized; in a PATCH that only updates some of the 10 fields, a null/blank field instead keeps whatever was already saved for it - only sending the whole themeColorPalette object as null resets every color back to the default at once.