Fix cash summary quantity bug; add Safe Count as own nav item

- Cash summary: derive total_quantity from total_amount/denomination_value
  so value_entered rows are counted (previously SUM(quantity) returned
  NULL for those rows)
- Safe Count: moved safe_cash out of Float Management tabs into its own
  /safe/* route with a dedicated sidebar entry (Vault icon)
- FloatManagement now only shows Petty Cash and Change Tin tabs

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/App.tsx

@@ -5,6 +5,7 @@ import { DailyCashUp } from './pages/DailyCashUp'
 import { History } from './pages/History'
 import { MultiDayReport } from './pages/MultiDayReport'
 import { FloatManagement } from './pages/FloatManagement'
+import { SafeCount } from './pages/SafeCount'
 import { CashSummary } from './pages/CashSummary'
 import { SettingsPage } from './pages/Settings'
 import type { User } from './types'
@@ -18,6 +19,7 @@ function AppRoutes({ user }: { user: User }) {
         <Route path="/history"  element={<History />} />
         <Route path="/report"   element={<MultiDayReport />} />
         <Route path="/floats/*" element={<FloatManagement />} />
+        <Route path="/safe/*"   element={<SafeCount />} />
         <Route path="/summary"  element={<CashSummary />} />
         <Route path="/settings" element={<SettingsPage user={user} />} />
         <Route path="*"         element={<Navigate to="/daily" replace />} />

frontend/src/components/Layout.tsx

@@ -1,6 +1,6 @@
 import { NavLink, useNavigate } from 'react-router-dom'
 import {
-  Banknote, ClipboardList, BarChart2, Wallet, FileText, Settings, LogOut,
+  Banknote, ClipboardList, BarChart2, Wallet, Vault, FileText, Settings, LogOut,
 } from 'lucide-react'
 import type { User } from '../types'
 
@@ -14,6 +14,7 @@ const navItems = [
   { to: '/history', label: 'History',          icon: ClipboardList },
   { to: '/report',  label: 'Weekly Report',    icon: BarChart2 },
   { to: '/floats',  label: 'Float Management', icon: Wallet },
+  { to: '/safe',    label: 'Safe Count',       icon: Vault },
   { to: '/summary', label: 'Cash Summary',     icon: FileText },
   { to: '/settings',label: 'Settings',         icon: Settings },
 ]

frontend/src/pages/FloatManagement.tsx

@@ -16,7 +16,7 @@ const TYPE_LABELS: Record<CountType, string> = {
 // Denominations relevant for each type (change_tin uses bags, no £0.02/£0.01)
 const CHANGE_TIN_DENOMS = GBP_DENOMINATIONS.filter(d => d.value >= 0.05)
 
-function FloatCountForm({ type }: { type: CountType }) {
+export function FloatCountForm({ type }: { type: CountType }) {
   const navigate = useNavigate()
   const [denomQtys, setDenomQtys] = useState<Record<number, number>>({})
   const [receipts, setReceipts] = useState<Array<{ amount: string; description: string }>>([])
@@ -173,7 +173,7 @@ function FloatCountForm({ type }: { type: CountType }) {
   )
 }
 
-function FloatHistory({ type }: { type: CountType }) {
+export function FloatHistory({ type }: { type: CountType }) {
   const [rows, setRows] = useState<FloatCount[]>([])
   const [total, setTotal] = useState(0)
   const [offset, setOffset] = useState(0)
@@ -279,9 +279,8 @@ function FloatHistory({ type }: { type: CountType }) {
 
 export function FloatManagement() {
   const tabs: Array<{ path: string; label: string; type: CountType }> = [
-    { path: 'petty-cash',  label: 'Petty Cash',  type: 'petty_cash' },
-    { path: 'change-tin',  label: 'Change Tin',  type: 'change_tin' },
-    { path: 'safe-cash',   label: 'Safe Cash',   type: 'safe_cash' },
+    { path: 'petty-cash', label: 'Petty Cash', type: 'petty_cash' },
+    { path: 'change-tin', label: 'Change Tin', type: 'change_tin' },
   ]
 
   return (

frontend/src/pages/SafeCount.tsx

@@ -0,0 +1,14 @@
+import { Routes, Route, Navigate } from 'react-router-dom'
+import { FloatCountForm, FloatHistory } from './FloatManagement'
+
+export function SafeCount() {
+  return (
+    <div style={{ padding: '1.5rem' }}>
+      <Routes>
+        <Route index element={<FloatCountForm type="safe_cash" />} />
+        <Route path="history" element={<FloatHistory type="safe_cash" />} />
+        <Route path="*" element={<Navigate to="" replace />} />
+      </Routes>
+    </div>
+  )
+}