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/styles/location.css

@@ -298,3 +298,20 @@
 #location-search.searching {
   opacity: 0.5;
 }
+
+.location-search-error {
+  /* Its own line under the search row, which clips overflow in the dock. */
+  margin: 6px 0 0;
+  padding: 6px 10px;
+  border: 1px solid rgba(255, 99, 99, 0.45);
+  border-radius: 6px;
+  background: rgba(30, 8, 10, 0.92);
+  color: #ffb3b3;
+  font-family: var(--font-sans);
+  font-size: 12px;
+  line-height: 1.35;
+}
+
+.location-search-error:empty {
+  display: none;
+}

src/ui/styles/scenes.css

@@ -363,7 +363,8 @@ html:not([lang='en']) #scene-panel .scene-controls .scene-btn {
 #param-slider-panel.collapsed #param-sliders,
 #location-bar.collapsed .poi-row-container,
 #location-bar.collapsed .location-bar-divider,
-#location-bar.collapsed .location-city-row {
+#location-bar.collapsed .location-city-row,
+#location-bar.collapsed .location-search-error {
   display: none !important;
 }