---
id: S03
parent: M011
milestone: M011
provides:
  - Compact nav search bar on all non-home pages with Cmd+K focus
  - Mobile hamburger menu with stacked nav links at <768px
requires:
  []
affects:
  - S04
key_files:
  - frontend/src/components/SearchAutocomplete.tsx
  - frontend/src/App.tsx
  - frontend/src/App.css
  - frontend/src/pages/Home.tsx
  - frontend/src/pages/SearchResults.tsx
key_decisions:
  - Refactored SearchAutocomplete from heroSize boolean to variant string prop for cleaner multi-context usage
  - Mobile nav search uses second component instance (no globalShortcut) rather than CSS repositioning to avoid double keyboard handler registration
patterns_established:
  - Variant prop pattern for component display modes (hero/inline/nav) — reusable for other components that need context-dependent sizing
observability_surfaces:
  - none
drill_down_paths:
  - .gsd/milestones/M011/slices/S03/tasks/T01-SUMMARY.md
  - .gsd/milestones/M011/slices/S03/tasks/T02-SUMMARY.md
duration: ""
verification_result: passed
completed_at: 2026-03-31T08:46:50.106Z
blocker_discovered: false
---

# S03: Global Search & Mobile Navigation

**Added compact nav search bar with Cmd+K shortcut on all non-home pages and mobile hamburger menu with 44px touch targets and three auto-close mechanisms.**

## What Happened

Two tasks delivered the slice goal cleanly. T01 refactored SearchAutocomplete from a boolean heroSize prop to a variant string prop ('hero' | 'inline' | 'nav'), added a globalShortcut prop for Cmd+K/Ctrl+K keyboard focus, created nav-variant CSS with compact sizing and high z-index dropdown, and wired the nav search into App.tsx conditionally on non-home routes. Home.tsx and SearchResults.tsx callers were updated to use the new variant prop. The deprecated heroSize prop remains as a backwards-compat fallback.

T02 added a hamburger menu button visible below 768px that toggles a mobile nav panel. Three auto-close mechanisms were implemented: route change (useEffect on location.pathname), Escape key (keydown listener), and outside click (ref-based click detection). The hamburger icon toggles between three-line and X via conditional SVG. All mobile nav links get min-height: 44px touch targets. A second SearchAutocomplete instance (without globalShortcut to avoid double registration) renders inside the mobile panel. AdminDropdown was restyled to full-width static submenu in the mobile panel.

Build passes cleanly (51 modules, 813ms). Both tasks verified via build and browser testing.

## Verification

Frontend build succeeds: `cd frontend && npm run build` — 51 modules transformed, built in 813ms, zero errors. Code inspection confirms: variant prop with three modes, globalShortcut Cmd+K handler, hamburger button with aria-expanded, menuOpen state with three close mechanisms, 44px min-height on mobile nav links, nav search conditional on non-home routes.

## Requirements Advanced

- R020 — Nav search bar rendered on all non-home pages with Cmd+K/Ctrl+K keyboard shortcut
- R021 — Hamburger menu visible below 768px with 44px touch targets, three auto-close mechanisms

## Requirements Validated

None.

## New Requirements Surfaced

None.

## Requirements Invalidated or Re-scoped

None.

## Deviations

SearchAutocomplete kept deprecated heroSize prop as fallback (variant takes precedence). Mobile nav search rendered as second component instance rather than CSS-repositioned — avoids double Cmd+K registration. AdminDropdown restyled to full-width in mobile panel.

## Known Limitations

None.

## Follow-ups

None.

## Files Created/Modified

- `frontend/src/components/SearchAutocomplete.tsx` — Replaced heroSize boolean with variant prop, added globalShortcut prop for Cmd+K, nav-variant rendering
- `frontend/src/App.tsx` — Added hamburger menu state, three auto-close mechanisms, conditional nav search, mobile menu panel
- `frontend/src/App.css` — Nav search compact styles, hamburger button, mobile breakpoint panel, 44px touch targets
- `frontend/src/pages/Home.tsx` — Updated caller to variant="hero"
- `frontend/src/pages/SearchResults.tsx` — Updated caller to variant="inline"
