The search panel is now the Skill browser. It opens in a side drawer from the top bar or with ⌘K and finds skills, your paths and the app's pages as before.
Billing opens in the same drawer. The plan and usage card has a Top up button that opens the drawer with the top-up options ready, and the account menu's Upgrade to Pro, or Manage plan for a paying learner, opens it at the plan. Checkout runs inside the drawer, and closing the drawer always closes an open checkout first, so the next purchase is never blocked. Paths and AI credits on the card now explain what each allowance is for.
Notifications open in the drawer too, from the bell in the top bar and on Home. The inbox lists the newest first with Mark as read, and on Home the reasons your path changed sit above it. The separate notifications page is gone; its address leads to Home.
Every drawer keeps keyboard focus inside while open and returns it to the control that opened it.