Use the storage icon for data sources

app/MindWork AI Studio/Components/DataSourceSelection.razor

@@ -7,11 +7,11 @@
         <MudTooltip Text="@T("Select the data you want to use here.")" Placement="Placement.Top">
             @if (this.PopoverTriggerMode is PopoverTriggerMode.ICON)
             {
-                <MudIconButton Icon="@Icons.Material.Filled.Source" Class="@this.PopoverButtonClasses" OnClick="@(() => this.ToggleDataSourceSelection())"/>
+                <MudIconButton Icon="@AppIcons.DATABASE" Class="@this.PopoverButtonClasses" OnClick="@(() => this.ToggleDataSourceSelection())"/>
             }
             else
             {
-                <MudButton Variant="Variant.Filled" StartIcon="@Icons.Material.Filled.Source" Class="@this.PopoverButtonClasses" OnClick="@(() => this.ToggleDataSourceSelection())">
+                <MudButton Variant="Variant.Filled" StartIcon="@AppIcons.DATABASE" Class="@this.PopoverButtonClasses" OnClick="@(() => this.ToggleDataSourceSelection())">
                     @T("Select data")
                 </MudButton>
             }

app/MindWork AI Studio/Components/DirectChatLauncherForm.razor

@@ -36,7 +36,7 @@
         <MudSelectItem T="string" Value="@chatTemplate.Id">@chatTemplate.GetSafeName()</MudSelectItem>
     }
 </MudSelect>
-<MudSelect T="string" Label="@T("Data sources (Optional)")" MultiSelection="@true" SelectedValues="@this.DataSourceIds" SelectedValuesChanged="@this.SetDataSourceIds" MultiSelectionTextFunc="@this.GetSelectedDataSourceText" Variant="Variant.Outlined" Margin="Margin.Dense" Class="mb-3 rounded-lg" Adornment="Adornment.Start" AdornmentIcon="@Icons.Material.Filled.Source">
+<MudSelect T="string" Label="@T("Data sources (Optional)")" MultiSelection="@true" SelectedValues="@this.DataSourceIds" SelectedValuesChanged="@this.SetDataSourceIds" MultiSelectionTextFunc="@this.GetSelectedDataSourceText" Variant="Variant.Outlined" Margin="Margin.Dense" Class="mb-3 rounded-lg" Adornment="Adornment.Start" AdornmentIcon="@AppIcons.DATABASE">
     @foreach (var dataSource in this.SettingsManager.ConfigurationData.DataSources)
     {
         <MudSelectItem T="string" Value="@dataSource.Id">@dataSource.Name</MudSelectItem>

app/MindWork AI Studio/Dialogs/Settings/SettingsDialogDataSources.razor

@@ -6,7 +6,7 @@
     <TitleContent>
         <PreviewPrototype/>
         <MudText Typo="Typo.h6" Class="d-flex align-center">
-            <MudIcon Icon="@Icons.Material.Filled.IntegrationInstructions" Class="mr-2"/>
+            <MudIcon Icon="@AppIcons.DATABASE" Class="mr-2"/>
             @T("Configured Data Sources")
         </MudText>
     </TitleContent>

app/MindWork AI Studio/Tools/AppIcons.cs

@@ -0,0 +1,20 @@
+namespace AIStudio.Tools;
+
+/// <summary>
+/// Icons we draw ourselves, because the Material icon set MudBlazor ships does not contain them.
+/// </summary>
+/// <remarks>
+/// The strings follow the same convention as the MudBlazor icons: they contain the SVG child
+/// elements only, drawn on a 24 by 24 canvas. MudIcon and every component taking an icon wrap them
+/// into the svg element themselves, which is why there must be no svg root element here.
+/// </remarks>
+public static class AppIcons
+{
+    /// <summary>
+    /// The classic database symbol: a cylinder made of three stacked discs.
+    /// </summary>
+    public const string DATABASE =
+        """
+        <path d="M5 4.6A7 2.6 0 0 1 19 4.6L19 8.9A7 2.6 0 0 1 5 8.9Z"/><path d="M5 9.9A7 2.6 0 0 0 19 9.9L19 14.1A7 2.6 0 0 1 5 14.1Z"/><path d="M5 15.1A7 2.6 0 0 0 19 15.1L19 19.4A7 2.6 0 0 1 5 19.4Z"/>
+        """;
+}