remove winhandler dependency

[AndreVto]

Description

(wip) doesn't seem needed? still checking

Recording

Type of Change

• Bug fix
• Performance / stability improvement
• Compatibility improvements
• Other (requires prior approval)

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• If I have access to #code-changes, I have discussed this change there and it has been green-lighted. If I do not have access, I have still provided clear context in this PR. If I skip both, I accept that this change may face delays in review, may not be reviewed at all, or may be closed.
• This change aligns with the current project scope (core functionality, stability, or performance). If not, it has been explicitly approved beforehand.
• I have attached a recording of the change.
• I have read and agree to the contribution guidelines in CONTRIBUTING.md.

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Summary by cubic

Removed winhandler.exe from all launch paths. We now start games and tools directly, reducing complexity across GOG, Epic, Amazon, Steam, and Custom Games.

• Refactors
  • Replaced winhandler.exe wrapping with direct commands in XServerScreen.kt (returns raw executable + args).
  • Standardized fallbacks to explorer.exe and direct paths without extra outer quotes.
  • Updated PreInstallSteps.wrapAsGuestExecutable to use cmd /c directly; wine explorer /desktop flow remains.

^{Written for commit 6260f99. Summary will update on new commits. Review in cubic}

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