fix(search): keep a missed location query in the field so it can be corrected (#1420)

A location search that found nothing or failed now keeps its query, the open field and focus (text selected), and shows a persistent role=alert message under the search row instead of a toast. Typing, a new search or closing the emptied field clears it. HAL-727.

src/ui/shellElements.js

@@ -180,6 +180,7 @@ export function readShellElements(document = globalThis.document) {
     _cctvSyncProgress: document.getElementById('cctv-sync-progress'),
     _toast: document.getElementById('toast'),
     _locationSearch: document.getElementById('location-search'),
+    _locationSearchError: document.getElementById('location-search-error'),
     _searchToggle: document.getElementById('search-toggle'),
     _locationPills: document.getElementById('location-pills'),
     _poiRow: document.getElementById('poi-row'),