Better account for gutter in code width

Author: hojberg

src/css/unison-share/page/code-page.css

@@ -1,3 +1,9 @@
+.code-page {
+  /* increase the readable-column-width-medium size to account for extra gutter
+   * space added by the fold toggle */
+  --readable-column-width-medium: calc(var(--readable-column-width-medium) + 2rem)
+}
+
 .code-page .sidebar .namespace-header {
   display: flex;
   flex-direction: row;