refactor: move font variable from desk to common file

frappe/public/scss/common/css_variables.scss

@@ -165,6 +165,16 @@
 	--bg-pink: var(--pink-50);
 	--bg-cyan: var(--cyan-50);
 
+	//font sizes
+	--text-xs: 11px;
+	--text-sm: 12px;
+	--text-md: 13px;
+	--text-base: 14px;
+	--text-lg: 16px;
+	--text-xl: 18px;
+	--text-2xl: 20px;
+	--text-3xl: 22px;
+
 	--text-on-blue: var(--blue-600);
 	--text-on-light-blue: var(--blue-500);
 	--text-on-dark-blue: var(--blue-700);

frappe/public/scss/desk/css_variables.scss

@@ -4,15 +4,6 @@ $input-height: 28px !default;
 
 :root,
 [data-theme="light"] {
-	--text-xs: 11px;
-	--text-sm: 12px;
-	--text-md: 13px;
-	--text-base: 14px;
-	--text-lg: 16px;
-	--text-xl: 18px;
-	--text-2xl: 20px;
-	--text-3xl: 22px;
-
 	// breakpoints
 	--xxl-width: map-get($grid-breakpoints, '2xl');
 	--xl-width: map-get($grid-breakpoints, 'xl');