fix(theme): center list bullets on text optical centre

src/shared/styles/theme.css

@@ -400,9 +400,8 @@
 .rich-text ul li::before {
   content: "";
   display: inline-block;
-  /* 0.5em glyph + 1em gap = 1.5em advance, filling the hanging indent */
-  width: 0.5em;
-  height: 0.5em;
+  width: 0.4em;
+  height: 0.4em;
   margin-right: 1em;
   /* reset inherited text-indent so the box isn't shifted */
   text-indent: 0;
@@ -411,7 +410,10 @@
   border-radius: 30%;
   /* biome-ignore lint/correctness/noUnknownProperty: corner-shape is valid CSS, newer than Biome's property list */
   corner-shape: squircle;
+  /* Nudge up off the x-height midpoint so the bullet sits on the text's
+   * optical centre; em-relative so it scales with the text. */
   vertical-align: middle;
+  transform: translateY(-0.1em);
 }
 
 /* Cross-section view transition (navigation between sections) */