Support MSI Updates with Restart Manager

[Enigmatrix]

This PR enhances how the application handles Windows MSI updates by properly responding to Restart Manager requests:

1. Restructured the main event loop to run on the main thread instead of a separate thread
2. Added proper handling of Windows Restart Manager messages:
   • Responds to WM_QUERYENDSESSION with a positive response when receiving ENDSESSION_CLOSEAPP
   • Gracefully exits the application when receiving WM_ENDSESSION with ENDSESSION_CLOSEAPP
3. Removed custom MSI installer properties that were forcing application termination during updates, as the application now properly handles shutdown requests

These changes allow the application to gracefully shut down during Windows updates or MSI installations, improving the user experience and preventing potential data loss during updates.

[Enigmatrix]

• Support MSI Updates with Restart Manager #345 👈 (View in Graphite)
• main

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[Copilot]

Pull request overview

This PR attempts to add Windows Restart Manager support to handle MSI updates gracefully. The application should respond to shutdown requests from the Windows Installer service and exit cleanly when updates are being installed.

Changes:

• Removed MSI installer properties that forced application termination
• Added Windows message handlers for WM_QUERYENDSESSION and WM_ENDSESSION to respond to Restart Manager requests
• Restructured the event loop to run on the main thread instead of a separate thread

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
src/ui/src-tauri/installer/main.wxs	Removed MSIRMSHUTDOWN and MSIRESTARTMANAGERCONTROL properties to allow proper Restart Manager integration
src/platform/src/events/system.rs	Added handlers for WM_QUERYENDSESSION and WM_ENDSESSION messages to respond to Restart Manager shutdown requests
src/engine/src/lib.rs	Restructured to move event_loop from a separate thread to the main thread after processor completes

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