Webb app: add platform guards and promote analyzer severity

[softworkz]

This should be merged last, otherwise it would cause errors

[Copilot]

Pull Request Overview

This PR adds platform-specific guards to prevent calling macOS/Windows-only Electron APIs on unsupported platforms and promotes the CA1416 analyzer (platform compatibility) to error severity to enforce these checks at compile time.

Key changes:

• Wraps Electron.Dock.SetMenu with IsMacOS() guard in Program.cs
• Wraps PowerMonitor event subscriptions with IsMacOS() || IsWindows() guard in HomeController.cs
• Adds .editorconfig to promote CA1416 to error severity

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/.editorconfig	Promotes CA1416 (platform compatibility) analyzer to error severity for all C# files
src/ElectronNET.WebApp/Program.cs	Adds macOS guard around Dock API usage
src/ElectronNET.WebApp/Controllers/HomeController.cs	Adds macOS/Windows guard around PowerMonitor event subscriptions

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[FlorianRappl]

LGTM!

[softworkz]

Ouch...

This should be merged last, otherwise it would cause errors

(but well - only until the others are merged...)