Add a back button to the creator profile page that returns the user to their previous location

[Chucks1093]

Summary

Users navigating to a creator profile from the marketplace or search results have no quick way to go back without using the browser button. A back button in the profile header should return them to the previous page using the router history.

Scope

• Add a back arrow button to the creator profile header
• On click, call router.back() to return to the previous location
• If there is no previous history entry, navigate to the marketplace as a fallback
• Button should not render during SSR (window history unavailable)

Acceptance Criteria

• Back button navigates to the previous page on click
• Falls back to marketplace when no history entry exists
• Button not rendered in SSR context
• Button positioned correctly in the profile header

ETA: 12 hours

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Coordinate on Telegram