Small fixes and improvements:

- StayExport - SpainParteViajerosProvider - Fixed validation for codigoPostal/codMunicipio.
- AddressQueryDialog - Add loading indication and "debounce" input to reduce API queries.

src/Somnia.GuestLog/Components/Controls/AddressQueryDialog.razor

@@ -17,13 +17,22 @@
         <MudStack row>
             <MudTextField @bind-Value="SearchText" Label="@LanguageLocale.control_AddressQueryDialog_searchText"
                           Required />
-            <MudIconButton Icon="@Icons.Material.Filled.Search" OnClick="btnSearchAddress" />
+            <MudIconButton Icon="@Icons.Material.Filled.Search" OnClick="btnSearchAddress" Disabled="@_isDataLoading" />
         </MudStack>
 
         <MudPaper Class="mt-4 pa-2">
-            @if (addressResults.Count == 0)
+            @if (addressResults.Count == 0 && !_isDataLoading)
             {
-                <MudText Typo="Typo.body1">@LanguageLocale.general_noResults</MudText>
+                <MudElement Style="width: 100%; height: 100px;" HtmlTag="div">
+                    <MudText Typo="Typo.body1" Align="Align.Center">
+                        @LanguageLocale.general_noResults
+                    </MudText>
+                </MudElement>
+            }
+
+            @if (_isDataLoading)
+            {
+                <MudSkeleton Width="100%" Height="100px" />
             }
 
             <MudList T="AddressResultDTO" @bind-SelectedValue="SelectedAddressResult"
@@ -81,6 +90,9 @@
     private List<AddressResultDTO> addressResults = [];
     private AddressResultDTO? SelectedAddressResult { get; set; }
 
+    private bool _isDataLoading = false;
+    private string _lastSearchText = "";
+
 
     private void Cancel()
     {
@@ -99,16 +111,20 @@
 
     private async Task btnSearchAddress()
     {
-        if (SearchText.Length == 0)
+        if (SearchText.Length == 0 || SearchText == _lastSearchText)
         {
             return;
         }
 
         try
         {
-            var queryService = addressQueryFactory.GetService();
+            _isDataLoading = true;
 
+            var queryService = addressQueryFactory.GetService();
             addressResults = await queryService.SearchAddressAsync(SearchText);
+            _lastSearchText = SearchText;
+
+            _isDataLoading = false;
         }
         catch (Exception ex)
         {

src/Somnia.GuestLog/Services/StayExport/StayExportProviderSpainParteViajeros.cs

@@ -306,7 +306,7 @@ public class StayExportProviderSpainParteViajeros(
                                 .NotEmpty()
                                 .When(p => p.pais != PersonDireccionPais_ESP)
                                 .MaximumLength(100);
-                            d.RuleFor(p => p.codigoMunicipio)
+                            d.RuleFor(p => p.codigoPostal)
                                 .NotEmpty()
                                 .MaximumLength(20);
                             d.RuleFor(p => p.pais)