Add iOS pull-to-refresh and PNG app icons

assets/css/app.css

@@ -128,6 +128,34 @@ body {
     color: var(--text);
 }
 
+.pull-refresh-indicator {
+    position: fixed;
+    top: max(0.85rem, env(safe-area-inset-top));
+    left: 50%;
+    z-index: 30;
+    padding: 0.72rem 1rem;
+    border-radius: 999px;
+    opacity: 0;
+    pointer-events: none;
+    transform: translate(-50%, -0.9rem) scale(0.96);
+    transition: opacity 160ms ease, transform 160ms ease;
+    color: var(--muted);
+    font-size: 0.92rem;
+    letter-spacing: 0.01em;
+}
+
+body.is-pull-refreshing .pull-refresh-indicator,
+body.is-pull-refresh-ready .pull-refresh-indicator,
+body.is-pull-refresh-reloading .pull-refresh-indicator {
+    opacity: 1;
+    transform: translate(-50%, 0) scale(1);
+}
+
+body.is-pull-refresh-ready .pull-refresh-indicator,
+body.is-pull-refresh-reloading .pull-refresh-indicator {
+    color: var(--text);
+}
+
 a {
     color: inherit;
     text-decoration: none;