fix(css): global main ul/ol bullet rules respect .not-prose opt-out

The global typography rules in app.css (main ul li → list-style: disc)
ran independently of Tailwind Typography, so `not-prose` on the
gallery grid couldn't suppress the bullets. Adding :not(.not-prose)
to those selectors makes the same opt-out class work for both
prose-managed and globally-styled lists, so the gallery grid renders
without disc markers and any future grid-of-list use case can opt out
the same way.

src/app.css

@@ -295,21 +295,21 @@ main strong {
   font-weight: 600;
 }
 
-main ul {
+main ul:not(.not-prose) {
   margin-left: 1em;
   margin-bottom: 1em;
 }
 
-main ul li {
+main ul:not(.not-prose) li {
   list-style: disc;
 }
 
-main ol {
+main ol:not(.not-prose) {
   margin-left: 1.1em;
   margin-bottom: 1em;
 }
 
-main ol li {
+main ol:not(.not-prose) li {
   list-style-type: decimal;
 }