* [MM-57557] Remove dead Email login button color settings from the server EmailSettings.LoginButtonColor, LoginButtonBorderColor and LoginButtonTextColor were plumbed into the client config as EmailLoginButtonColor / EmailLoginButtonBorderColor / EmailLoginButtonTextColor, but no client — web or mobile — ever consumed them, so the email login button was never colored by these values. Remove the fields from the config struct and its defaults, drop the three client config props, and update the config fixtures that carried them. Also fixes MM-57556 and MM-57804, and follows the same removal already done for the AD/LDAP (MM-70140) and SAML (MM-70141) equivalents. * [MM-57557] Remove Email login button colors from the webapp and docs Drop the three Email Login Button Color settings from the Admin Console Experimental Features section along with their en.json strings, remove the matching ClientConfig and AdminConfig EmailSettings entries to stay in sync with the server model, and delete the corresponding documentation entries. The experimental settings doc's jq example referenced EmailSettings.LoginButtonColor, which no longer exists; point it at EmailSettings.EmailBatchingBufferSize instead.
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