Added a way to read what the AI received from your sources (#1100)

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

app/Tests/Components/FileActionsTests.cs

@@ -0,0 +1,32 @@
+using AIStudio.Components;
+using AIStudio.Tools;
+
+namespace AIStudio.Tests.Components;
+
+/// <summary>
+/// Checks which actions a path gets: those of a file, those of a web page, or none.
+/// </summary>
+/// <remarks>
+/// A button which cannot work must not show: a relative path would open another file depending on
+/// where it is opened from, and the address of a mail names it for AI Studio only.
+/// </remarks>
+[TestFixture]
+public sealed class FileActionsTests
+{
+    [Test]
+    public void AnAbsolutePathIsAFile() => Assert.That(FileActions.DetermineKind(Path.Combine(Path.GetTempPath(), "minutes.pdf")), Is.EqualTo(FileActions.FileActionsKind.FILE));
+
+    [TestCase("https://example.org/budget-2026")]
+    [TestCase("http://intranet.example.org/wiki/page")]
+    public void AWebAddressIsAWebPage(string address) => Assert.That(FileActions.DetermineKind(address), Is.EqualTo(FileActions.FileActionsKind.WEB_PAGE));
+
+    [TestCase("")]
+    [TestCase("notes/minutes.txt")]
+    public void ARelativePathOrNothingGetsNoActions(string path) => Assert.That(FileActions.DetermineKind(path), Is.EqualTo(FileActions.FileActionsKind.NONE));
+
+    [Test]
+    public void AMailGetsNoActions() => Assert.That(FileActions.DetermineKind(SourceExtensions.CreateMailSourceUrl("6a1f2b3c-4d5e-4f60-8a7b-9c0d1e2f3a4b", "mail-1")), Is.EqualTo(FileActions.FileActionsKind.NONE));
+
+    [Test]
+    public void WhatOnlyADataSourceKnowsGetsNoActions() => Assert.That(FileActions.DetermineKind(SourceExtensions.CreateRetrievalSourceUrl("handbook.pdf", "docs/handbook.pdf")), Is.EqualTo(FileActions.FileActionsKind.NONE));
+}