test(manager): cover the self-update controls in both update panels

[afonsojramos]

Summary

The automatic-update controls went missing from the Linux managed-Spotify panel once (fixed in #40) because the Manager has two update panels and nothing checked both. These tests render the real ManagerPage in each mode and assert the controls are there.

• modules/manager/updatePanels.test.mts: SpicetifySelfUpdate on its own, and ManagerPage in the regular panel and the managed Linux panel (manifest managedSpotify: "stable", asserting the "Linux stable" badge so the test knows which panel rendered). With a daemon reporting autoUpdate and a newer version than the manifest's cliVersion, the "Install Spicetify updates automatically" toggle and the "Spicetify X is installed. Apply to use it in Spotify." prompt appear inside the Updates section; with a daemon that predates the setting, the toggle is absent.
• Adds react-test-renderer 18.3.1 (matching React 18.3.1) as a devDependency. The stdlib import is stubbed with registerHooks, as the lyrics-plus tests do.

Testing

• 6 new tests pass with no React warnings. Removing {children} from managedSpotify.tsx fails both Linux-panel tests; removing the regular branch's {selfUpdate} from page.tsx fails both regular tests.
• Manager tests: 44 pass. Test-only change, so no version bump (release.ts status --soft: ok).

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• modules/manager/updatePanels.test.mts
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