Let the chat template of a launcher decide its tools and data sources

app/MindWork AI Studio/Components/DirectChatLauncherForm.razor

@@ -51,4 +51,20 @@
     }
 </MudSelect>
 
-<ToolSelectionField Component="Components.CHAT" SelectedToolIds="@this.ToolIds" SelectedToolIdsChanged="@this.SetToolIds" Label="@T("Tools (Optional)")" Help="@T("These tools are preselected when the chat opens. Users can change the selection in the chat, and every tool has to meet the confidence requirements of the provider in use.")"/>
+@* A chat template wins over what is chosen here, so the form says so before somebody picks
+   something which would never take effect: *@
+@if (this.SelectedChatTemplate.DataSourceOptions is not null)
+{
+    <MudText Typo="Typo.body2" Class="mud-text-secondary mb-3">
+        @T("The chosen chat template brings data sources of its own, and those win over a selection made here. Only a template can also leave the choice of sources to the AI, which is why it decides this on its own.")
+    </MudText>
+}
+
+<ToolSelectionField Component="Components.CHAT" SelectedToolIds="@this.ToolIds" SelectedToolIdsChanged="@this.SetToolIds" Label="@T("Tools (Optional)")" Help="@T("These tools are preselected when the chat opens. Users can change the selection in the chat, and every tool has to meet the confidence requirements of the provider in use.")"/>
+
+@if (this.SelectedChatTemplate.ToolIds is not null)
+{
+    <MudText Typo="Typo.body2" Class="mud-text-secondary">
+        @T("The chosen chat template brings tools of its own, and those win over a selection made here.")
+    </MudText>
+}

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

@@ -1,3 +1,5 @@
+using AIStudio.Settings;
+
 using Microsoft.AspNetCore.Components;
 
 namespace AIStudio.Components;
@@ -81,6 +83,19 @@ public partial class DirectChatLauncherForm : MSGComponentBase
     /// </summary>
     private bool OpensTemporaryChat => string.IsNullOrWhiteSpace(this.WorkspaceName);
 
+    /// <summary>
+    /// The chat template the launcher would open its chat with, as far as it is known here.
+    /// </summary>
+    /// <remarks>
+    /// With "use chat default" chosen, this is whichever template the chat options name right now,
+    /// and that may well be another one by the time somebody opens the launcher. The form therefore
+    /// only says what such a template brings along instead of disabling the fields below it: a field
+    /// which locks itself behind the user's back is worse than a sentence explaining the situation.
+    /// </remarks>
+    private ChatTemplate SelectedChatTemplate => string.IsNullOrWhiteSpace(this.ChatTemplateId)
+        ? this.SettingsManager.GetPreselectedChatTemplate(Tools.Components.CHAT)
+        : this.SettingsManager.GetChatTemplateById(this.ChatTemplateId);
+
     private IReadOnlyList<WorkspaceTreeWorkspace> availableWorkspaces = [];
 
     private static readonly Dictionary<string, object?> USER_INPUT_ATTRIBUTES = new();