fara timeout fix

[miguelg719]

why

what changed

test plan

---

Summary by cubic

Adds a 750ms delay before taking screenshots in MicrosoftCUAClient to prevent FARA timeouts when the provider isn’t ready. Improves reliability of screenshot capture without changing the returned data.

Why:

• Screenshots were requested too soon, causing FARA to time out.
• A brief wait ensures the screenshot provider is ready.

What:

• Add a 750ms await before calling screenshotProvider() in MicrosoftCUAClient, then return the same data:image/png;base64 string.

Test Plan:

• Trigger screenshot capture via MicrosoftCUAClient and confirm no timeout errors.
• Verify the response starts with "data:image/png;base64," and decodes to a valid PNG.
• Check logs/timing to see ~750ms delay before capture.

^{Written for commit b10fe65. Summary will update automatically on new commits.}

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Latest commit: b10fe65

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