💄 style: fix numbered code blocks on iOS Safari

Tables used for line numbers were inheriting incorrect font sizes on iOS Safari
due to WebKit's text size adjustment behaviour.

Short lines were being centred, too.

sass/parts/_code.scss

@@ -1,4 +1,5 @@
 code {
+    -webkit-text-size-adjust: 100%;
     border-radius: 5px;
     background-color: var(--bg-1);
     padding-inline: 0.2em;
@@ -31,7 +32,7 @@ code {
         tbody td:first-child {
             opacity: 50%;
             padding-inline-end: 0.8rem;
-            width: 0rem;
+            width: 1px;  // Without this, iOS Safari centres short lines.
             user-select: none;
             text-align: end;
         }