UniGetUI: download ældre versioner

This is a minor release to address a regression with missing bundled DLLs from the Windows App SDK
General changes
- Fix self-contained Windows App SDK packaging

This release includes further work into the Devolutions transition, and lays the foundations required for a full cross-platform Avalonia port.
General changes
- Added an experimental Avalonia-based cross-platform UniGetUI preview port
- Fixed GitHub cloud backup sign-in issues caused by OAuth configuration problems
- Improved WinGet reliability by preferring the bundled COM activation path
- Fixed update detection to handle four-part version numbers correctly
- Reapplied DPI sizing fixes to improve scaling behavior on high-DPI displays
- Brought all translations up to 100% completion state
- Migrated the build and release flow to .NET 10

Changelog
Devolutions UniGetUI 2026.1.0
This is the first Devolutions-branded UniGetUI release. It focuses on the transition to Devolutions distribution and update infrastructure, while improving updater reliability, package-manager bundling, and release integrity.
General changes
- UniGetUI now checks for updates through the Devolutions product info feed, with a fallback to the legacy GitHub updater source if needed.
- Update validation has been hardened with SHA256 integrity checks and installer signer validation.
- WinGet bundling has been reworked with architecture-aware bundled CLI selection and better fallback handling.
- Legacy packaged binaries have been cleaned up as part of the new packaging flow.
- The in-app announcements panel has been removed from Settings.
- Project links, publisher metadata, and update endpoints have been updated for the Devolutions transition.
- Translations and screenshots/icons have been refreshed across this release cycle.
Under the hood
- Added a new PowerShell-based build, signing, and release pipeline.
- Added release draft support and dry-run signing improvements in the release workflow.
- Added caching for WinGet CLI payloads in release automation.
- Improved release workflow compatibility for repositories using either main or master.