Use the storage icon for data sources

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"/>
+        """;
+}