Add Google Play Games integration settings

[tudddorrr]

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[claude]

PR Review: Add Google Play Games Integration Settings

Security - Client secret rendered as plain text

In GooglePlayGamesIntegrationDetails.tsx, the OAuth client secret TextInput has no type="password", so the value is visible as the user types. The fix is to include it in inputExtra alongside the register spread.

Minor - Index-based button selection in tests

Integrations.test.tsx uses positional indexing to click the correct "Enable integration" button (enableButtons[0] for Steamworks, enableButtons[1] for Google Play). If tile order ever changes, the tests will silently test the wrong integration. A more specific selector would make this robust.

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Overall the integration is well-structured: discriminated union schema, solid test coverage, consistent patterns with Steamworks. The client secret masking is the main thing to address before merge.