fix(frontend): Fix filter modal not closing on Escape key

Remove the isFilterModeActive check from the Escape key handler in
FacetDropdown. This fixes a race condition where KeyboardShortcuts
would clear the filter mode state before FacetDropdown could handle
the Escape key, leaving the regular dropdown open instead of closing.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: enko

apps/frontend/src/lib/components/search/FacetDropdown.svelte

@@ -214,7 +214,7 @@ $effect(() => {
 <!-- Handle Escape key to close modal -->
 <svelte:window
   onkeydown={(e) => {
-    if (e.key === 'Escape' && isOpen && $isFilterModeActive) {
+    if (e.key === 'Escape' && isOpen) {
       e.preventDefault();
       e.stopPropagation();
       closeModal();