Replace direct equality checks with errors.Is for context.Canceled

[Copilot]

Direct equality comparison with context.Canceled fails when errors are wrapped. This affects cancellation handling across install, update, launch, and download operations.

Changes

• Replace err == context.Canceled with errors.Is(err, context.Canceled) in:
  • cmd_launch.go - game launch cancellation
  • cmd_install.go - install cancellation
  • cmd_update.go - update cancellation
  • download/downloader.go - download progress and worker cancellation (2 locations)

Example

// Before
if err == context.Canceled {
    return nil
}

// After  
if errors.Is(err, context.Canceled) {
    return nil
}

This ensures proper detection of context cancellation even when errors are wrapped by intermediate layers.

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[Copilot]

Pull request overview

This PR improves error handling for context cancellation across multiple operations by replacing direct equality checks with errors.Is(). This ensures proper detection of context cancellation even when errors are wrapped by intermediate layers.

Key changes:

• Updated cancellation checks in command handlers (launch, install, update)
• Fixed download worker and progress cancellation detection
• Added errors package imports where needed

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
download/downloader.go	Updated two context cancellation checks in download progress handling and worker routine to use errors.Is()
cmd_update.go	Updated update cancellation check to use errors.Is() for proper wrapped error detection
cmd_install.go	Updated install cancellation check to use errors.Is() for proper wrapped error detection

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