Refresh device filter buttons when switching variants

Call updateDependentFilters() when selecting or deselecting a variant so
filter buttons (e.g. device) reflect only devices with actual data for
the active variant.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

app.js

@@ -267,6 +267,7 @@ familyNav.addEventListener("click", async e => {
     if (variantItem) {
         filters.variant = variantItem.dataset.variant;
         renderSidebar();
+        updateDependentFilters();
         render();
         return;
     }
@@ -281,6 +282,7 @@ familyNav.addEventListener("click", async e => {
     } else {
         filters.variant = null;
         renderSidebar();
+        updateDependentFilters();
         render();
     }
 });

style.css

@@ -116,7 +116,7 @@ code {
 .sidebar-variant {
     display: block;
     padding: 0.35rem 1.25rem 0.35rem 2.25rem;
-    font-size: 1rem;
+    font-size: 1.1rem;
     font-weight: 400;
     color: var(--text-dim);
     cursor: pointer;