docs(ui): center the active nav link in the sidebar instead of edge-clamping

The clamp put deep-linked highlights flush against the sidebar's bottom
edge. Centering is simpler AND handles the max-scroll case for free:
scrollTop carries the item's center to the scrollport center, and the
browser clamps to the scroll extent — items near the nav's top/bottom
land as centered as the content allows (scroll pinned fully up/down),
which is the requested fallback.

web/src/docs.ts

@@ -45,23 +45,27 @@ function scrollSidebarToActive(): void {
   const sidebar = document.getElementById("docs-sidebar");
   if (!sidebar) return;
 
-  // Skip the off-canvas mobile drawer (translated off screen).
+  // The class list ALWAYS carries -translate-x-full on desktop too
-  if (sidebar.classList.contains("-translate-x-full")) return;
+  // (lg:translate-x-0 overrides it only at the media-query level), so
+  // classList can't tell viewports apart — match the tailwind lg
+  // breakpoint explicitly: below it the sidebar is the off-canvas drawer.
+  if (!window.matchMedia("(min-width: 1024px)").matches) return;
 
   const active = sidebar.querySelector<HTMLAnchorElement>(
     `a[href="${location.pathname}"], a[href="${location.pathname.replace(/\.md$/, "")}"]`,
   );
   if (!active) return;
 
+  // Run once the browser has applied styles and laid the sidebar out.
+  requestAnimationFrame(() => {
     const sb = sidebar.getBoundingClientRect();
     const ar = active.getBoundingClientRect();
-  if (ar.top >= sb.top && ar.bottom <= sb.bottom) return; // already visible
+    // Center the active item in the sidebar's visible area. The browser
-
+    // clamps scrollTop to the scroll extent, so items near the top or
-  if (ar.top < sb.top) {
+    // bottom of the nav land "as centered as possible" (scroll pinned all
-    sidebar.scrollTop += ar.top - sb.top;
+    // the way up/down) — no manual edge-clamping needed.
-  } else {
+    sidebar.scrollTop += ar.top - sb.top - sb.height / 2 + ar.height / 2;
-    sidebar.scrollTop += ar.bottom - sb.bottom;
+  });
-  }
 }
 
 let docsSearchTimeout: ReturnType<typeof setTimeout> | null = null;
@@ -153,5 +157,5 @@ Alpine.data("docs", () => ({
   toggleCollapsible,
   initializeSearch: initializeDocsSearch,
   initializeCodeCopyButtons,
-  scrollSidebarToActive,
+  scrollSidebarToActive: () => requestAnimationFrame(scrollSidebarToActive),
 }));