Fix hydration mismatches with client-side checks

[seansoreilly]

Add client-side rendering checks to prevent hydration mismatches in the verify page.

Changes made:

• Add isClient state and useEffect to track client-side rendering
• Wrap localStorage operations with typeof window !== "undefined" checks
• Conditionally render timestamp display based on isClient state
• Add client-side check before window.location.reload() in SignInButton
• Update verification time display to only show when client-side
• Add trailing commas to function parameters for consistency

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