Add a Release notes item to the updates context menu

[Gabriel Dufresne (GabrielDuf)]

Right-clicking an update on the Software Updates page now shows Release notes. It opens the release-notes URL the package manager reports in the browser. When the manager only reports release-notes text, it opens the package details window, where that text is shown.

The item is enabled only when the package actually has release notes, and the update list doesn't load any slower:

• A new SupportsReleaseNotes capability marks the managers whose details can carry release notes: WinGet, Chocolatey, PowerShell, PowerShell 7 and .NET tool. For every other manager the item is disabled and nothing is looked up.
• For a supported manager, the menu uses the package's details if they're already loaded. Otherwise it loads that one package's details in the background when the menu opens, and enables the item once they arrive.

Scoop, npm and Bun are left out on purpose:

• Scoop's notes field holds post-install instructions, not a changelog.
• Scoop's checkver URL is a version-checking address that is often a raw API or JSON endpoint.
• npm and Bun always report the npmjs.com versions tab, which isn't release notes and would keep the item enabled for every package.

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Closes #5510

[Copilot]

🟢 Approval recommended

Static review found no blocking issues in capability gating, deferred loading, or navigation; runtime UI validation was not performed.

0 open findings

What changed in this PR

Adds quick access to release notes from the Software Updates context menu, addressing #5510.

Changes:

• Adds release-notes capability flags for five supported managers.
• Loads package details on demand and enables the item only when release notes are available.
• Opens release-note URLs in the browser, with package details as the text-only fallback.

File	Description
src/​UniGetUI.PackageEngine.Managers.WinGet/​WinGet.cs	Enables release-notes support.
src/​UniGetUI.PackageEngine.Managers.PowerShell7/​PowerShell7.cs	Enables release-notes support.
src/​UniGetUI.PackageEngine.Managers.PowerShell/​PowerShell.cs	Enables release-notes support.
src/​UniGetUI.PackageEngine.Managers.Dotnet/​DotNet.cs	Enables release-notes support.
src/​UniGetUI.PackageEngine.Managers.Chocolatey/​Chocolatey.cs	Enables release-notes support.
src/​UniGetUI.PackageEngine.Enums/​ManagerCapabilities.cs	Defines the capability, disabled by default.
src/​UniGetUI.Avalonia/​Views/​SoftwarePages/​SoftwareUpdatesPage.cs	Adds the menu item, deferred loading, and navigation.

🧠 Review effort: Balanced

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[randy-but-a-ro]

🤖 Pull request was approved automatically: the AI review is complete and all its review threads are resolved. 🎉

Integration Details

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