fix(os-homepage): refresh elizaOS E2E baselines

[NubsCarson]

Summary

• update os-homepage Playwright assertions for the current CloudVideoBackground and shared-brand resized USB asset
• remove the stale cloud-video test mask reference
• refresh Linux visual regression baselines against the current generated elizaOS homepage assets

Verification

• bun run --cwd packages/os-homepage lint:check
• bun run --cwd packages/os-homepage typecheck
• bun run --cwd packages/os-homepage build
• bun run --cwd packages/os-homepage test:e2e (84 passed)

Context

• Follow-up to merged PR fix(os): harden elizaOS smoke checks and USB installer boundary #7790. That PR fixed the OS release manifest, USB installer, and Linux smoke surfaces, but the OS release workflow still exposed stale os-homepage visual baselines.

[coderabbitai]

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