Show loading indicator while search is in progress

Co-authored-by: michaeljolley <1228996+michaeljolley@users.noreply.github.com>

Author: Copilot

WeatherExtension/Pages/WeatherListPage.cs

@@ -27,6 +27,7 @@ internal sealed partial class WeatherListPage : DynamicListPage, IDisposable
     private readonly CancellationTokenSource _cts = new();
 
     private IListItem[] _items = [];
+    private bool _isLoading;
     private string _lastSearchQuery = string.Empty;
     private CancellationTokenSource _searchCts = new();
 
@@ -101,6 +102,12 @@ private async Task LoadWeatherForLocation(GeocodingResult location, Cancellation
 
             if (weatherData?.Current == null)
             {
+                lock (_sync)
+                {
+                    _isLoading = false;
+                }
+
+                RaiseItemsChanged();
                 return;
             }
 
@@ -112,16 +119,24 @@ private async Task LoadWeatherForLocation(GeocodingResult location, Cancellation
             lock (_sync)
             {
                 _items = items.ToArray();
+                _isLoading = false;
             }
 
             RaiseItemsChanged();
         }
         catch (Exception ex)
         {
+            lock (_sync)
+            {
+                _isLoading = false;
+            }
+
             ExtensionHost.LogMessage(new LogMessage
             {
                 Message = $"Failed to load weather for location: {ex.Message}",
             });
+
+            RaiseItemsChanged();
         }
     }
 
@@ -257,6 +272,13 @@ private async Task PerformSearchAsync(string query, CancellationToken ct)
     {
         try
         {
+            lock (_sync)
+            {
+                _isLoading = true;
+            }
+
+            RaiseItemsChanged();
+
             var locations = await _geocodingService.SearchLocationAsync(query, ct).ConfigureAwait(false);
 
             // Re-check cancellation after the async call returns so that stale results
@@ -278,6 +300,7 @@ private async Task PerformSearchAsync(string query, CancellationToken ct)
                 lock (_sync)
                 {
                     _items = [noResultsItem];
+                    _isLoading = false;
                 }
 
                 RaiseItemsChanged();
@@ -315,6 +338,7 @@ private async Task PerformSearchAsync(string query, CancellationToken ct)
             lock (_sync)
             {
                 _items = items.ToArray();
+                _isLoading = false;
             }
 
             RaiseItemsChanged();
@@ -325,10 +349,17 @@ private async Task PerformSearchAsync(string query, CancellationToken ct)
         }
         catch (Exception ex)
         {
+            lock (_sync)
+            {
+                _isLoading = false;
+            }
+
             ExtensionHost.LogMessage(new LogMessage
             {
                 Message = $"Search error: {ex.Message}",
             });
+
+            RaiseItemsChanged();
         }
     }
 
@@ -354,6 +385,18 @@ public override IListItem[] GetItems()
     {
         lock (_sync)
         {
+            if (_isLoading)
+            {
+                return
+                [
+                    new ListItem(new NoOpCommand())
+                    {
+                        Title = Resources.loading_data,
+                        Icon = Icons.WeatherIcon,
+                    },
+                ];
+            }
+
             return _items;
         }
     }