---
id: T01
parent: S05
milestone: M015
provides: []
requires: []
affects: []
key_files: ["frontend/src/components/AdminDropdown.tsx"]
key_decisions: ["Used useRef for matchMedia and leave timer to avoid re-renders on breakpoint changes"]
patterns_established: []
drill_down_paths: []
observability_surfaces: []
duration: ""
verification_result: "cd frontend && npm run build — TypeScript compilation and Vite build passed with zero errors."
completed_at: 2026-04-03T04:41:01.800Z
blocker_discovered: false
---

# T01: Added hover-to-open with 150ms leave delay and matchMedia desktop guard (≥769px) to AdminDropdown

> Added hover-to-open with 150ms leave delay and matchMedia desktop guard (≥769px) to AdminDropdown

## What Happened
---
id: T01
parent: S05
milestone: M015
key_files:
  - frontend/src/components/AdminDropdown.tsx
key_decisions:
  - Used useRef for matchMedia and leave timer to avoid re-renders on breakpoint changes
duration: ""
verification_result: passed
completed_at: 2026-04-03T04:41:01.800Z
blocker_discovered: false
---

# T01: Added hover-to-open with 150ms leave delay and matchMedia desktop guard (≥769px) to AdminDropdown

**Added hover-to-open with 150ms leave delay and matchMedia desktop guard (≥769px) to AdminDropdown**

## What Happened

Added onMouseEnter/onMouseLeave handlers to the AdminDropdown container div, guarded by a matchMedia('(min-width: 769px)') ref so hover only fires on desktop. On mouseleave, a 150ms setTimeout bridges the CSS gap between trigger and menu. The matchMedia listener updates the desktop flag dynamically on resize. Click-to-toggle, Escape close, and outside-click close remain intact.

## Verification

cd frontend && npm run build — TypeScript compilation and Vite build passed with zero errors.

## Verification Evidence

| # | Command | Exit Code | Verdict | Duration |
|---|---------|-----------|---------|----------|
| 1 | `cd frontend && npm run build` | 0 | ✅ pass | 3200ms |


## Deviations

None.

## Known Issues

None.

## Files Created/Modified

- `frontend/src/components/AdminDropdown.tsx`


## Deviations
None.

## Known Issues
None.
