Enhance update functionality and logging

[Gabriel Dufresne (GabrielDuf)]

This pull request introduces significant improvements to the update flow for UniGetUI, focusing on better logging, user feedback, and robustness in handling interrupted update attempts. The changes also add a user-facing command to manually check for updates in the Avalonia UI and ensure all running app variants are properly terminated during updates or installation.

Key changes include:

Auto-updater logging and robustness improvements:

• Introduced a dedicated per-attempt updater log in AutoUpdater.cs, allowing users to view logs specific to their last update attempt. This log is now used for all update-related logging, with new helper methods (LogUpdateInfo, LogUpdateWarn, etc.) replacing direct Logger calls. A "View log" button is now provided in relevant update banners for better troubleshooting.
• Added detection for interrupted (orphaned) update attempts: on startup, if the previous update was interrupted, a warning banner is shown with an option to view the update log. This helps users understand if their update succeeded or failed.
• Update banners now include more detailed feedback, including severity, titles, messages, and actionable buttons, improving user experience during update flows.

User interface enhancements:

• Added a "Check for UniGetUI updates" menu item to the sidebar in the Avalonia UI, allowing users to manually trigger update checks. This is backed by a new command in SidebarViewModel.
• The update banner in the Avalonia UI now properly reflects update status changes and can show results from both automatic and manual checks.

Installer and process management:

• Ensured that UniGetUI.Avalonia.exe is also terminated during updates or uninstallation, preventing conflicts when replacing files. This change is reflected in both the Inno Setup script and the KillRunningApps procedure.

These changes collectively make the update process more transparent, robust, and user-friendly.

[Copilot]

Pull request overview

This PR enhances UniGetUI’s self-update experience across WinUI and Avalonia by adding per-attempt update logging, improved user-facing update status reporting (including “View log” actions), a manual “check for updates” command in the Avalonia sidebar, and stronger process termination during install/uninstall.

Changes:

• Added a per-update-attempt log (persisted to a temp file) and “View log” affordances for update banners, plus startup detection of interrupted/orphaned update attempts.
• Added manual “Check for UniGetUI updates” UI entry points (WinUI menu item + Avalonia sidebar command) and richer Avalonia banner status updates via a new StatusChanged event.
• Updated installer/uninstaller behavior to terminate UniGetUI.Avalonia.exe to prevent file-replacement conflicts.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
UniGetUI.iss	Ensures the Avalonia executable is terminated during install/uninstall to avoid update conflicts.
src/UniGetUI/Pages/MainView.xaml	Adds a WinUI menu item to manually trigger a UniGetUI update check.
src/UniGetUI/Pages/MainView.xaml.cs	Wires the new WinUI menu item to invoke the updater in manual/verbose mode.
src/UniGetUI/AutoUpdater.cs	Adds per-attempt update logging, orphaned-attempt detection, and improved installer-exit handling + “View log” actions.
src/UniGetUI.Avalonia/Views/SidebarView.axaml	Adds “Check for UniGetUI updates” menu item to the Avalonia sidebar.
src/UniGetUI.Avalonia/ViewModels/SidebarViewModel.cs	Adds a command to trigger manual update checks from the Avalonia UI.
src/UniGetUI.Avalonia/ViewModels/MainWindowViewModel.cs	Subscribes to updater status events and surfaces them through the Updates banner; checks for orphaned attempts at startup.
src/UniGetUI.Avalonia/Infrastructure/AvaloniaAutoUpdater.cs	Adds per-attempt logging, richer status reporting, orphaned-attempt detection, and multi-platform installer launch behaviors.

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