fix(ui): scope data-search-count lookup to the filter widget

v2-search-filter resolved `list` relative to `[data-search-scope]`
but then picked `count` via a global `document.querySelector`. That
works on current pages (one widget per page) but is a footgun: the
moment a second filter widget ships on any page (e.g. sidebar facet
plus top-of-list), both filters would end up driving the same count
element. Applying the same scope/document fallback pattern we
already use for `list` — scope first, document fallback for legacy
single-widget layouts that put count outside the scope. Per review
on PR #571.

Signed-off-by: Sebastian Mendel <sebastian.mendel@netresearch.de>
Signed-off-by: Sebastian Mendel <info@sebastianmendel.de>

Author: CybotTM

internal/web/static/js/v2-search-filter.js

@@ -24,7 +24,14 @@
         var items = Array.prototype.slice.call(
             list.querySelectorAll("[data-search-item]")
         );
-        var count = document.querySelector("[data-search-count]");
+        // Keep count scoped consistently with `list` — if more than one
+        // [data-search-filter] widget is ever rendered on a page the
+        // document-wide lookup would point every filter at the first
+        // count element. The document fallback is kept for legacy
+        // single-widget pages that put the count outside the scope.
+        var count =
+            scope.querySelector("[data-search-count]") ||
+            document.querySelector("[data-search-count]");
         var debounceTimer = null;
 
         input.setAttribute("role", "searchbox");