fix(css): darkmode + readermode safari height

quartz/components/styles/darkmode.scss

@@ -5,7 +5,7 @@
   background: none;
   border: none;
   width: 20px;
-  height: 20px;
+  height: 32px;
   margin: 0;
   text-align: inherit;
   flex-shrink: 0;

quartz/components/styles/readermode.scss

@@ -5,7 +5,7 @@
   background: none;
   border: none;
   width: 20px;
-  height: 20px;
+  height: 32px;
   margin: 0;
   text-align: inherit;
   flex-shrink: 0;