CmdPal: Get version when running as unpacked app (#44540)

## Summary of the Pull Request

This PR updates how the Settings / General page retrieves version
information for unpackaged apps.
It prevents a crash by reading the version from the process executable,
with a fallback to displaying a question mark when the version cannot be
determined.

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## PR Checklist

- [ ] Closes: #xxx
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issues) -->
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [ ] **Tests:** Added/updated and all pass
- [ ] **Localization:** All end-user-facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [ ] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [ ] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

<!-- Provide a more detailed description of the PR, other things fixed,
or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments

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wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed

src/modules/cmdpal/Microsoft.CmdPal.UI/Settings/GeneralPage.xaml.cs

@@ -2,6 +2,10 @@
 // The Microsoft Corporation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
+using System.Diagnostics;
+using System.Globalization;
+using ManagedCommon;
+using Microsoft.CmdPal.UI.Helpers;
 using Microsoft.CmdPal.UI.ViewModels;
 using Microsoft.CmdPal.UI.ViewModels.Services;
 using Microsoft.Extensions.DependencyInjection;
@@ -30,8 +34,56 @@ public sealed partial class GeneralPage : Page
     {
         get
         {
-            var version = Package.Current.Id.Version;
-            return $"Version {version.Major}.{version.Minor}.{version.Build}.{version.Revision}";
+            var versionNo = ResourceLoaderInstance.GetString("Settings_GeneralPage_VersionNo");
+            if (!TryGetPackagedVersion(out var version) && !TryGetAssemblyVersion(out version))
+            {
+                version = "?";
+            }
+
+            return string.Format(CultureInfo.CurrentCulture, versionNo, version);
+        }
+    }
+
+    private static bool TryGetPackagedVersion(out string version)
+    {
+        version = string.Empty;
+        try
+        {
+            // Package.Current throws InvalidOperationException if the app is not packaged
+            var v = Package.Current.Id.Version;
+            version = $"{v.Major}.{v.Minor}.{v.Build}.{v.Revision}";
+            return true;
+        }
+        catch (InvalidOperationException)
+        {
+            return false;
+        }
+        catch (Exception ex)
+        {
+            Logger.LogError("Failed to get version from the package", ex);
+            return false;
+        }
+    }
+
+    private static bool TryGetAssemblyVersion(out string version)
+    {
+        version = string.Empty;
+        try
+        {
+            var processPath = Environment.ProcessPath;
+            if (string.IsNullOrEmpty(processPath))
+            {
+                return false;
+            }
+
+            var info = FileVersionInfo.GetVersionInfo(processPath);
+            version = $"{info.FileMajorPart}.{info.FileMinorPart}.{info.FileBuildPart}.{info.FilePrivatePart}";
+            return true;
+        }
+        catch (Exception ex)
+        {
+            Logger.LogError("Failed to get version from the executable", ex);
+            return false;
         }
     }
 }

src/modules/cmdpal/Microsoft.CmdPal.UI/Strings/en-us/Resources.resw

@@ -724,4 +724,7 @@ Right-click to remove the key combination, thereby deactivating the shortcut.</v
   <data name="Settings_ExtensionsPage_More_ReorderFallbacks_MenuFlyoutItem.Text" xml:space="preserve">
     <value>Manage fallback order</value>
   </data>
+  <data name="Settings_GeneralPage_VersionNo" xml:space="preserve">
+    <value>Version {0}</value>
+  </data>
 </root>