[Quick Accent] Remove wpfui

[niels9001]

Summary of the Pull Request

This PR removes the dependency on the WpfUI library and uses plain WPF.

PR Checklist

• Communication: I've discussed this with core contributors already. If the work hasn't been agreed, this work might be rejected
• Tests: Added/updated and all pass
• Localization: All end-user-facing strings can be localized
• Dev docs: Added/updated
• New binaries: Added on the required places
  • JSON for signing for new binaries
  • WXS for installer for new binaries and localization folder
  • YML for CI pipeline for new test projects
  • YML for signed pipeline
• Documentation updated: If checked, please file a pull request on our docs repo and link it here: #xxx

Detailed Description of the Pull Request / Additional comments

• Replaced ui:FluentWindow with a standard WPF Window and removed the xmlns:ui WpfUI namespace
• Replaced <Rectangle.Fill><SolidColorBrush /></Rectangle.Fill> with an inline Fill= attribute on the selection indicator rectangle
• Simplified App.xaml by removing WpfUI theme/controls resource dictionaries and using ThemeMode="System" instead
• Fixed XAML formatting: converted empty <Application> to a self-closing tag, removed extra blank lines in Window.Resources and inside ControlTemplate

Validation Steps Performed

• Manually verified the Quick Accent overlay renders correctly with accent character selection and character name display

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[niels9001]

@copilot fix xaml formatting

[Copilot]

@copilot fix xaml formatting

Fixed in fada277:

• App.xaml: Converted empty <Application> to self-closing tag
• Selector.xaml: Removed double blank line before </Window.Resources> and extra blank line inside ControlTemplate's <Grid>

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• 2kmvsblobprodcus39.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet tool restore --disable-parallel --no-cache (dns block)
  • Triggering command: /usr/bin/dotnet dotnet tool restore grep -l ^<Window xaml (dns block)
• yttvsblobprodcus357.vsblob.vsassets.io
  • Triggering command: /usr/bin/dotnet dotnet tool install --global xamlstyler.console --version 3.2501.8 (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
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