feat(steam): open details for uninstalled games

[wizzomafizzo]

Check official Steam app installation state across main and secondary libraries before automatic launches. Open details when installation cannot be confirmed, while preserving explicit actions and non-Steam shortcuts.

Share preflight across Linux, Windows, and macOS; bound metadata parsing and avoid publishing ActiveMedia for details redirects. Add regression and fuzz coverage.

Closes #471

[coderabbitai]

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Review configuration:

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Team

Run ID: b1fdaab7-2137-4142-bc43-3e356b32d5bf

📥 Commits

Reviewing files that changed from the base of the PR and between 5aefeb6 and 502938f.

📒 Files selected for processing (13)

• pkg/platforms/launch.go
• pkg/platforms/platforms.go
• pkg/platforms/shared/steam/appmanifest.go
• pkg/platforms/shared/steam/client.go
• pkg/platforms/shared/steam/client_darwin.go
• pkg/platforms/shared/steam/client_darwin_test.go
• pkg/platforms/shared/steam/client_linux.go
• pkg/platforms/shared/steam/client_linux_test.go
• pkg/platforms/shared/steam/client_windows.go
• pkg/platforms/shared/steam/client_windows_test.go
• pkg/platforms/shared/steam/installation.go
• pkg/platforms/shared/steam/installation_test.go
• pkg/platforms/shared/steam/preflight_test.go

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[codecov]

Codecov Report

❌ Patch coverage is 94.44444% with 7 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
pkg/platforms/shared/steam/installation.go	93.81%	6 Missing ⚠️
pkg/platforms/shared/steam/client.go	95.00%	1 Missing ⚠️

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