polish(web): search pill aria-pressed, keepPreviousData, plural result count, URL-hydration test

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/src/i18n/en.json

@@ -25,7 +25,8 @@
     "empty": "No results",
     "loadError": "Search is unavailable",
     "loadMore": "Load more",
-    "resultCount": "{{count}} results",
+    "resultCount_one": "{{count}} result",
+    "resultCount_other": "{{count}} results",
     "selectPrompt": "Select a result to see the full record"
   },
   "publish": {

web/src/i18n/sv.json

@@ -25,7 +25,8 @@
     "empty": "Inga träffar",
     "loadError": "Sök är inte tillgängligt",
     "loadMore": "Visa fler",
-    "resultCount": "{{count}} träffar",
+    "resultCount_one": "{{count}} träff",
+    "resultCount_other": "{{count}} träffar",
     "selectPrompt": "Välj en träff för att se hela posten"
   },
   "publish": {