feat(website): show desc-row on index page when a filter is active

On category pages desc-rows are always visible. On the index page they
were always hidden. Now they become visible whenever a tag/category
filter is applied, giving filtered results the same richness as category
pages.

Also tightens two related CSS rules: border-bottom suppression only
fires when the adjacent desc-row is actually visible, and the expand-row
description is hidden while the desc-row is already showing to avoid
duplicate text.

Co-Authored-By: Claude <noreply@anthropic.com>

website/static/main.js

@@ -132,6 +132,7 @@ function collapseAll() {
 
 function applyFilters() {
   const query = searchInput ? searchInput.value.toLowerCase().trim() : "";
+  const descRowsVisible = !isIndexDocument || activeFilter !== null;
   let visibleCount = 0;
 
   collapseAll();
@@ -159,8 +160,11 @@ function applyFilters() {
     }
 
     if (row.hidden !== !show) row.hidden = !show;
-    if (row._descRow && row._descRow.hidden !== !show) {
-      row._descRow.hidden = !show;
+    if (row._descRow) {
+      const descHidden = !show || !descRowsVisible;
+      if (row._descRow.hidden !== descHidden) {
+        row._descRow.hidden = descHidden;
+      }
     }
 
     if (show) {

website/static/style.css

@@ -788,7 +788,7 @@ kbd {
   box-shadow: inset 3px 0 0 var(--accent);
 }
 
-.row:has(+ .desc-row) td {
+.row:has(+ .desc-row:not([hidden])) td {
   border-bottom-color: transparent;
   padding-bottom: 0.35rem;
 }
@@ -980,6 +980,10 @@ th[data-sort].sort-asc::after {
   display: table-row;
 }
 
+.desc-row:not([hidden]) + .expand-row .expand-desc {
+  display: none;
+}
+
 .expand-row td {
   padding-top: 0.1rem;
   padding-bottom: 1.15rem;