fix: replace window.location.href with router.push in playground-header

[narutamaaurum]

Fixes #461 - window.location.href in playground-header causes full-page reload instead of client-side navigation

The "Back to Dashboard" button in the playground header used which triggers a full browser page reload instead of Next.js client-side SPA navigation.

This fix:

1. Imports from
2. Uses for client-side navigation

This preserves the SPA session (Monaco Editor, WebContainer SDK, Yjs, AI state) without the white flash and full re-download of assets. Also enables future unsaved-changes guards to work correctly.

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Reviewing files that changed from the base of the PR and between f12b223 and 52b8e1b.

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• modules/playground/components/playground-header.tsx

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