Mobile nav: replace bottom icon bar with burger menu for consistency

Matches the slide-in sidebar + top-bar burger pattern used by other apps (maintenance, cashup) instead of the bottom tab bar.

frontend/src/App.tsx

@@ -1,5 +1,5 @@
 import { useState } from 'react'
-import { DollarSign, CalendarDays, TrendingUp, BarChart3, Wallet, Settings } from 'lucide-react'
+import { DollarSign, CalendarDays, TrendingUp, BarChart3, Wallet, Settings, Menu } from 'lucide-react'
 import AuthGate, { useAuth } from './components/AuthGate'
 import { UpdateBanner } from './components/UpdateBanner'
 import { useVersionCheck } from './hooks/useVersionCheck'
@@ -25,13 +25,19 @@ const NAV: { id: Page; label: string; icon: React.ElementType; cap?: string }[]
 function Shell() {
   const { user } = useAuth()
   const [page, setPage] = useState<Page>('weekly')
+  const [menuOpen, setMenuOpen] = useState(false)
 
   const hotelName = import.meta.env.VITE_HOTEL_NAME || 'Hotel'
 
   const visibleNav = NAV.filter(n => !n.cap || can(user, n.cap))
 
+  function selectPage(id: Page) {
+    setPage(id)
+    setMenuOpen(false)
+  }
+
   return (
-    <div className="app-shell">
+    <div className={`app-shell${menuOpen ? ' menu-open' : ''}`}>
       <nav className="sidebar">
         <div className="sidebar-logo">
           <DollarSign size={16} strokeWidth={1.75} />
@@ -42,7 +48,7 @@ function Shell() {
             <div
               key={n.id}
               className={`nav-item${page === n.id ? ' active' : ''}`}
-              onClick={() => setPage(n.id)}
+              onClick={() => selectPage(n.id)}
             >
               <n.icon size={16} strokeWidth={1.75} />
               {n.label}
@@ -54,6 +60,16 @@ function Shell() {
         </div>
       </nav>
 
+      {menuOpen && <div className="menu-backdrop" onClick={() => setMenuOpen(false)} />}
+
+      <header className="top-bar">
+        <button className="top-bar-burger" onClick={() => setMenuOpen(o => !o)}>
+          <Menu size={20} strokeWidth={1.75} />
+        </button>
+        <DollarSign size={18} strokeWidth={1.75} color="var(--gold)" />
+        <span className="top-bar-title">Wage Costs</span>
+      </header>
+
       <main className="content">
         {page === 'weekly'         && <Weekly />}
         {page === 'monthly'        && <Monthly />}
@@ -62,19 +78,6 @@ function Shell() {
         {page === 'budgets'        && <Budgets />}
         {page === 'settings'       && <SettingsPage />}
       </main>
-
-      <nav className="bottom-nav">
-        {visibleNav.map(n => (
-          <div
-            key={n.id}
-            className={`bottom-nav-item${page === n.id ? ' active' : ''}`}
-            onClick={() => setPage(n.id)}
-          >
-            <n.icon size={18} strokeWidth={1.75} />
-            <span>{n.label}</span>
-          </div>
-        ))}
-      </nav>
     </div>
   )
 }

frontend/src/index.css

@@ -402,46 +402,59 @@ input[type="text"]:focus {
   font-size: 14px;
 }
 
-/* ── Bottom nav (mobile only) ───────────────────────────────────── */
-.bottom-nav {
+/* ── Top bar + burger (mobile only) ────────────────────────────── */
+.top-bar {
   display: none;
-  position: fixed;
-  bottom: 0; left: 0; right: 0;
+  height: var(--topbar-h);
   background: var(--navy);
-  border-top: 1px solid rgba(255,255,255,0.1);
-  z-index: 200;
-  height: 58px;
-  justify-content: space-around;
-  align-items: stretch;
-}
-
-.bottom-nav-item {
-  display: flex;
-  flex-direction: column;
+  color: #fff;
   align-items: center;
-  justify-content: center;
-  gap: 3px;
-  color: rgba(255,255,255,0.45);
-  font-size: 10px;
-  cursor: pointer;
-  flex: 1;
-  min-width: 0;
-  padding: 4px 2px;
-  transition: color 0.15s;
-  user-select: none;
+  padding: 0 12px;
+  gap: 10px;
+  flex-shrink: 0;
 }
 
-.bottom-nav-item.active { color: var(--gold); }
-.bottom-nav-item:hover  { color: rgba(255,255,255,0.85); }
+.top-bar-title {
+  flex: 1;
+  font-size: 15px;
+  font-weight: 600;
+  color: var(--gold);
+}
+
+.top-bar-burger {
+  background: none;
+  border: none;
+  color: #fff;
+  cursor: pointer;
+  display: flex;
+  align-items: center;
+  padding: 4px;
+  flex-shrink: 0;
+}
+
+.menu-backdrop {
+  position: fixed;
+  inset: 0;
+  background: rgba(0,0,0,0.5);
+  z-index: 199;
+}
 
 /* ── Mobile breakpoint ──────────────────────────────────────────── */
 @media (max-width: 640px) {
-  .sidebar     { display: none; }
-  .bottom-nav  { display: flex; }
+  .app-shell   { flex-direction: column; }
+  .top-bar     { display: flex; }
+
+  .sidebar {
+    position: fixed;
+    top: 0; left: 0; bottom: 0;
+    z-index: 200;
+    transform: translateX(calc(-1 * var(--sidebar-w)));
+    transition: transform 0.25s ease;
+  }
+  .app-shell.menu-open .sidebar { transform: translateX(0); }
 
   .content {
     padding: 12px;
-    padding-bottom: 68px; /* clear bottom nav */
   }
 
   .card {