Topbar is the single, compliant top navigation bar for every authenticated Flows/Fusion app. It is a shadcn registry component (installed via ), not an npm package. - Storybook: https://cognitedata.github.io/aura/storybook/?path=/docs/primitives-topbar--docs - Full rules: RULES.md · Interview: INTERVIEW.md · Install + code: IMPLEMENTATION.md Non-negotiables: Exactly one Topbar per page, composed only from primitives, installed via the shadcn CLI only. If installation fails, surface the blocker — never build a custom header fallback. See RULES.md §1, §11, §12. --- Step 0 — Auto-prompt hook set…