Add PowerKit; replace hand-rolled Box<T> with Cell<T>

[Copilot]

• Add PowerKit (0.0.0-a.3) to Directory.Packages.props
• Update PolyShim from 2.7.0 to 2.9.0 in Directory.Packages.props
• Add PowerKit reference (PrivateAssets="all") to Gress.csproj
• Delete Gress/Utils/Box.cs
• Update ProgressExtensions.cs: replace Box<T> → Cell<T>, remove using Gress.Utils, rename lastValueBox → lastValueCell
• Upgrade Avalonia 11.3.13 → 11.3.14 (fixes NU1903 build error; Tmds.DBus.Protocol 0.21.2 → 0.21.3)
• dotnet build succeeds (full solution, 0 warnings, 0 errors)

[Tyrrrz]

@copilot build fails

[Copilot]

Pull request overview

This PR introduces PowerKit as a source-only (dev) dependency and replaces the project’s internal Box<T> helper with PowerKit’s Cell<T>, while also bumping PolyShim to the version required by PowerKit.

Changes:

• Add PowerKit (dev-only) package reference and central package version.
• Update ProgressExtensions to use PowerKit.Cell<T> instead of Gress.Utils.Box<T>.
• Remove the now-redundant Gress/Utils/Box.cs implementation and bump PolyShim to 2.9.0.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
Directory.Packages.props	Adds PowerKit version and bumps PolyShim to align dependencies.
Gress/Gress.csproj	References PowerKit with PrivateAssets="all" to keep it non-transitive.
Gress/Utils/Box.cs	Deletes the hand-rolled container type now replaced by PowerKit.
Gress/ProgressExtensions.cs	Swaps Box<T> usage for Cell<T> and updates the using directive.

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[Copilot]

@copilot build fails

Fixed in be5a1bc. Avalonia.Desktop 11.3.13 pulled in Tmds.DBus.Protocol 0.21.2 (GHSA-xrw6-gwf8-vvr9), which was being treated as a build error via TreatWarningsAsErrors. Bumped all Avalonia packages from 11.3.13 → 11.3.14, which uses the patched Tmds.DBus.Protocol 0.21.3. Full solution now builds without errors.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.10%. Comparing base (2c199c6) to head (be5a1bc).
⚠️ Report is 1 commits behind head on prime.

Additional details and impacted files

@@            Coverage Diff             @@
##            prime      #27      +/-   ##
==========================================
- Coverage   90.52%   90.10%   -0.42%     
==========================================
  Files          11       10       -1     
  Lines         190      182       -8     
  Branches       19       18       -1     
==========================================
- Hits          172      164       -8     
  Misses         13       13              
  Partials        5        5              

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