Kept overlapping settings operations from freezing the Document Analysis assistant (#970)

Co-authored-by: Thorsten Sommer <SommerEngineering@users.noreply.github.com>

app/MindWork AI Studio/Components/ProviderSelection.razor

@@ -1,7 +1,10 @@
 @using AIStudio.Settings
 @inherits MSGComponentBase
+@{
+    var availableProviderItems = this.GetAvailableProviderSelectionItems().ToList();
+}
 <MudSelect T="Provider" Value="@this.ProviderSettings" ValueChanged="@this.SelectionChanged" Validation="@this.ValidateProvider" Margin="Margin.Dense" Label="@T("Provider")" Class="mb-3 rounded-lg" OuterClass="flex-grow-0" Variant="Variant.Outlined" Disabled="@this.Disabled">
-    @foreach (var providerItem in this.GetAvailableProviderSelectionItems())
+    @foreach (var providerItem in availableProviderItems)
     {
         <MudSelectItem Value="@providerItem.Provider">
             <MudStack Row="true" AlignItems="AlignItems.Center" Justify="Justify.SpaceBetween" Class="w-100" Wrap="Wrap.NoWrap">
@@ -20,4 +23,10 @@
             </MudStack>
         </MudSelectItem>
     }
-</MudSelect>
+</MudSelect>
+@if (availableProviderItems.Count is 0 && this.GetEmptySelectionHint() is { } emptySelectionHint)
+{
+    <MudText Typo="Typo.body2" Color="Color.Error" Class="mb-3">
+        @emptySelectionHint
+    </MudText>
+}

app/MindWork AI Studio/Components/ProviderSelection.razor.cs

@@ -53,6 +53,28 @@ public partial class ProviderSelection : MSGComponentBase
             yield return new(provider, this.GetCapabilityIcons(provider));
     }
 
+    /// <summary>
+    /// Says why there is nothing to choose from, or nothing at all when that is not the user's doing.
+    /// </summary>
+    /// <remarks>
+    /// An empty list has two causes the user can act on, and they lead to different places in the
+    /// settings: there is no provider yet, or none of the configured ones reaches the confidence
+    /// this component asks for. Naming the wrong one sends the user looking in the wrong place --
+    /// a first start has nobody to blame for a confidence level it never set. A missing or invalid
+    /// component is a third case and neither of those: it is a defect, it was logged as one, and
+    /// any explanation offered to the user here would be a guess.
+    /// </remarks>
+    private string? GetEmptySelectionHint()
+    {
+        if (this.Component is null or Tools.Components.NONE)
+            return null;
+
+        if (!this.SettingsManager.GetAllProviders().Any(x => x.UsedLLMProvider is not LLMProviders.NONE))
+            return this.T("No LLM providers are configured yet. Add a provider in the app settings.");
+
+        return this.T("No LLM providers meet the confidence requirements. Configure an eligible provider in the app settings.");
+    }
+
     private IReadOnlyList<CapabilityIcon> GetCapabilityIcons(AIStudio.Settings.Provider provider)
     {
         var profile = provider.GetModelProfile();