---
id: S01
parent: M006
milestone: M006
provides:
  - AdminDropdown component pattern for header navigation grouping
requires:
  []
affects:
  []
key_files:
  - frontend/src/components/AdminDropdown.tsx
  - frontend/src/App.tsx
  - frontend/src/App.css
key_decisions:
  - Used BEM naming convention for dropdown CSS: admin-dropdown / __trigger / __menu / __item
  - Used calc(100% + 0.5rem) for menu offset to add visual breathing room below the trigger
patterns_established:
  - Click-outside + Escape close pattern for dropdowns, adapted from Home.tsx typeahead
observability_surfaces:
  - none
drill_down_paths:
  - .gsd/milestones/M006/slices/S01/tasks/T01-SUMMARY.md
duration: ""
verification_result: passed
completed_at: 2026-03-30T11:03:20.635Z
blocker_discovered: false
---

# S01: Admin Navigation Dropdown + Header Cleanup

**Header nav consolidated: Home/Topics/Creators as flat links, Admin dropdown for Review/Reports/Pipeline, ModeToggle removed from header**

## What Happened

Created AdminDropdown.tsx — a self-contained dropdown component with useState toggle, useRef-based click-outside listener, Escape key handler, and proper ARIA attributes (aria-expanded, aria-haspopup, role=menu, role=menuitem). Three admin links (Review Queue, Reports, Pipeline) render as React Router Links inside the dropdown menu. Updated App.tsx to replace the three flat admin Link elements and the ModeToggle component with a single AdminDropdown. ModeToggle was not deleted — it's still imported and used by ReviewQueue.tsx. Appended BEM-style CSS (.admin-dropdown, __trigger, __menu, __item) to App.css using existing theme custom properties (--color-text-on-header, --color-bg-surface, --color-border, --color-shadow-heavy, --color-bg-surface-hover). Menu offset uses calc(100% + 0.5rem) for visual breathing room.

## Verification

TypeScript compilation (npx tsc --noEmit) passed with zero errors from frontend/. Vite production build succeeded — 47 modules transformed, built in 766ms. Both verification commands exit 0.

## Requirements Advanced

None.

## Requirements Validated

None.

## New Requirements Surfaced

None.

## Requirements Invalidated or Re-scoped

None.

## Deviations

None.

## Known Limitations

Dropdown has no animation/transition on open/close — it appears/disappears instantly. Adequate for an admin tool.

## Follow-ups

None.

## Files Created/Modified

- `frontend/src/components/AdminDropdown.tsx` — New component: dropdown trigger + menu with 3 admin links, click-outside/Escape close, ARIA attributes
- `frontend/src/App.tsx` — Replaced 3 flat admin Links + ModeToggle with single AdminDropdown import
- `frontend/src/App.css` — Appended BEM-style dropdown CSS using existing theme custom properties
