Clarify update guidance and strongly type Linux package detection (#925)

app/MindWork AI Studio/Tools/Rust/LinuxPackageType.cs

@@ -0,0 +1,19 @@
+namespace AIStudio.Tools.Rust;
+
+/// <summary>
+/// Identifies how the Linux build was packaged.
+/// </summary>
+public enum LinuxPackageType
+{
+    /// <summary>An unknown or future Linux package type reported by the runtime.</summary>
+    UNKNOWN,
+
+    /// <summary>The app is not running on Linux.</summary>
+    NOT_APPLICABLE,
+
+    /// <summary>An AppImage build.</summary>
+    APP_IMAGE,
+
+    /// <summary>A Flatpak build.</summary>
+    FLATPAK,
+}

app/MindWork AI Studio/Tools/Rust/RuntimeInfoResponse.cs

@@ -1,3 +1,3 @@
 namespace AIStudio.Tools.Rust;
 
-public readonly record struct RuntimeInfoResponse(string WorkingDirectory, string ExecutablePath, string LinuxPackageType, InstallationKind InstallationKind);
+public readonly record struct RuntimeInfoResponse(string WorkingDirectory, string ExecutablePath, LinuxPackageType LinuxPackageType, InstallationKind InstallationKind);