Allow Contractors to create and access their own Studio account using the same login, and switch between Contractor and Studio contexts without logging out.

Functionality

• Add “Switch to Studio Account” in the Contractor profile dropdown for users without a Studio.
• Launch the standard Agency Onboarding flow when selected.
• After onboarding, make the user the Studio Owner with the standard 14-day free trial.
• Users with both accounts should have:
  • Switch to Studio
  • Switch to Contractor
• Switching should not require separate credentials or logout.
• Contractor and Studio data/permissions must remain isolated.
• Creating a Studio must not affect the Contractor's existing agency relationships or permissions.
  
  FRD Link - https://docs.google.com/document/d/1YcLlFgbJ2Gm6PXq9PCm0hjoEhBssIfRL8kpDce-hXVM/edit?tab=t.64zhselvpgce