address review nits on dark mode warning callout + alpha consistency

- standardize alpha values to 2-decimal form (0.1 → 0.10) so the
  surface depth scale reads uniformly (0.02 / 0.04 / 0.08 / 0.10 / 0.14)
- add comment above warning callout block noting the selector depends
  on mintlify's yellow-* tailwind classes and silently no-ops if renamed

Author: pbjaru

style.css

@@ -183,15 +183,15 @@ table tbody td:first-child {
 html.dark .prose table,
 html.dark article table,
 html.dark table {
-  border-color: rgba(237, 238, 240, 0.1) !important;
+  border-color: rgba(237, 238, 240, 0.10) !important;
   background-color: rgba(237, 238, 240, 0.02) !important;
 }
 
 html.dark .prose table thead th,
 html.dark article table thead th,
 html.dark table thead th {
   background-color: rgba(237, 238, 240, 0.04) !important;
-  border-bottom-color: rgba(237, 238, 240, 0.1) !important;
+  border-bottom-color: rgba(237, 238, 240, 0.10) !important;
 }
 
 html.dark .prose table tbody tr,
@@ -219,7 +219,7 @@ html.dark {
 /* hero bot dark recolor */
 html.dark img[src*="/images/tinker-bot.svg"] { content: url("/images/tinker-bot-dark.svg"); }
 
-/* warning callout */
+/* warning callout — selector depends on mintlify's yellow-* classes; renames silently break this */
 html.dark .callout[class*="yellow"] {
   background-color: rgba(237, 238, 240, 0.03) !important;
   border-color: rgba(237, 238, 240, 0.10) !important;