Draft: Add tier badge to nav and user menu

What does this MR do and why?

Just for demo purposes. Add tier badge to nav and user menu. Updates nav and breadcrumb to be Subscription instead of Billing.

References

Screenshots or screen recordings

CleanShot_2025-10-02_at_14.58.23

How to set up and validate locally

  1. Run in SaaS mode
  2. Visit a group/project or use the user menu

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