Use custom chat resizer values.

services/web/app/views/project/editor.pug

@@ -43,8 +43,8 @@ block content
 
 		#chat-wrapper.full-size(
 			layout="chat",
-			spacing-open="12",
-			spacing-closed="0",
+			spacing-open="{{ui.chatResizerSizeOpen}}",
+			spacing-closed="{{ui.chatResizerSizeClosed}}",
 			initial-size-east="250",
 			init-closed-east="true",
 			open-east="ui.chatOpen",

services/web/public/coffee/ide.coffee

@@ -76,6 +76,8 @@ define [
 			pdfWidth: 0
 			reviewPanelOpen: localStorage("ui.reviewPanelOpen.#{window.project_id}")
 			miniReviewPanelVisible: false
+			chatResizerSizeOpen: window.uiConfig.chatResizerSizeOpen
+			chatResizerSizeClosed: window.uiConfig.chatResizerSizeClosed
 		}
 		$scope.onboarding = {
 			autoCompile: if window.showAutoCompileOnboarding then 'unseen' else 'dismissed'