feat: major dashboard & waiter PWA overhaul

- Manager dashboard: replaced monolithic DashboardTab/OperationsPage with new
  DashboardPage; added OrderDetailModal, ShiftDetailModal, DeleteConfirmModal,
  PaymentMethodModal; updated Sidebar routing and App navigation
- Reports: reworked WorkDaySummary, OrderHistory, ShiftsOverview with detail modals
- Backend routers: extended orders, reports, shifts, products, business_day endpoints;
  updated cloud_sync service
- Waiter PWA: refreshed app icons, improved ConnectionLostModal UX, updated
  TableCard, SSEContext, connectionStore; added useProductCache hook; vite config tweaks

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

manager_dashboard/src/pages/reports/restaurant/WorkDaySummary.jsx

@@ -1,39 +1,208 @@
 import { useState } from 'react'
-import { useQuery } from '@tanstack/react-query'
+import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
+import { Trash2 } from 'lucide-react'
+import toast from 'react-hot-toast'
 import { LineChart, Line, XAxis, YAxis, CartesianGrid, Tooltip, ResponsiveContainer } from 'recharts'
 import client from '../../../api/client'
 import { FilterBar, FilterDateInput } from '../shared/FilterBar'
-import { Panel, DataTable, THead, TH, TR, TD, StatusBadge, ChartTooltip } from '../shared/TablePrimitives'
+import { Panel, DataTable, THead, TH, TR, TD, StatusBadge, WaiterAvatar, ChartTooltip } from '../shared/TablePrimitives'
 import DrillDownModal from '../shared/DrillDownModal'
+import OrderDetailModal from '../shared/OrderDetailModal'
+import ShiftDetailModal from '../shared/ShiftDetailModal'
+import DeleteConfirmModal from '../../../ui/DeleteConfirmModal'
 import EmptyState from '../shared/EmptyState'
 import SkeletonTable from '../shared/SkeletonTable'
 import ExportButton from '../shared/ExportButton'
-import { fmtEUR, fmtNum, fmtDate, fmtTime, fmtDuration } from '../shared/reportDesignTokens'
+import { fmtEUR, fmtNum, fmtDate, fmtTime, fmtDuration, fmtDateTime } from '../shared/reportDesignTokens'
 
 function today() { return new Date().toISOString().slice(0, 10) }
 function monthAgo() { const d = new Date(); d.setDate(d.getDate() - 30); return d.toISOString().slice(0, 10) }
 
+// ── Workday drill-down modal ────────────────────────────────────────────────
+function WorkDayModal({ day, onClose, onDeleteShift }) {
+  const [tab, setTab] = useState('orders')
+  const [drillOrder, setDrillOrder] = useState(null)
+  const [detailShift, setDetailShift] = useState(null)
+
+  const { data: ordersData } = useQuery({
+    queryKey: ['business-day-orders', day.id],
+    queryFn: () => client.get('/api/reports/orders/history', { params: { business_day_id: day.id, page_size: 200 } }).then(r => r.data),
+    staleTime: 0,
+  })
+
+  const { data: shiftsData } = useQuery({
+    queryKey: ['shifts-for-day', day.id],
+    queryFn: () => client.get('/api/reports/shifts', { params: { business_day_id: day.id } }).then(r => r.data),
+    staleTime: 0,
+  })
+
+  const orders = Array.isArray(ordersData) ? ordersData : []
+  const shifts = shiftsData?.shifts || []
+
+  const TABS = [
+    { key: 'orders', label: `Παραγγελίες (${orders.length})` },
+    { key: 'shifts', label: `Βάρδιες (${shifts.length})` },
+  ]
+
+  return (
+    <>
+      <DrillDownModal
+        title={`Εργάσιμη Μέρα · ${fmtDate(day.opened_at)}`}
+        subtitle={`${fmtEUR(day.revenue)} έσοδα · ${fmtTime(day.opened_at)} – ${day.closed_at ? fmtTime(day.closed_at) : 'ανοιχτή'}`}
+        onClose={onClose}
+      >
+        {/* Tabs */}
+        <div className="flex border-b border-slate-200 px-6">
+          {TABS.map(t => (
+            <button
+              key={t.key}
+              onClick={() => setTab(t.key)}
+              className={`px-4 py-2.5 text-[13px] font-medium border-b-2 transition-colors ${tab === t.key ? 'border-slate-800 text-slate-900' : 'border-transparent text-slate-500 hover:text-slate-700'}`}
+            >
+              {t.label}
+            </button>
+          ))}
+        </div>
+
+        {/* Orders tab */}
+        {tab === 'orders' && (
+          orders.length === 0
+            ? <div className="py-12 text-center text-slate-400 text-sm">Δεν βρέθηκαν παραγγελίες</div>
+            : <DataTable>
+                <THead>
+                  <TH>#</TH><TH>Τραπέζι</TH><TH>Άνοιξε</TH><TH>Έκλεισε</TH>
+                  <TH align="right">Είδη</TH><TH align="right">Σύνολο</TH><TH>Κατάσταση</TH>
+                </THead>
+                <tbody>
+                  {orders.map(o => {
+                    const total = (o.items || []).filter(i => i.status !== 'cancelled').reduce((s, i) => s + i.unit_price * i.quantity, 0)
+                    return (
+                      <TR key={o.id} striped onClick={() => setDrillOrder(o)} className="cursor-pointer">
+                        <TD mono>#{o.id}</TD>
+                        <TD>{o.table_name ?? o.table_id}</TD>
+                        <TD mono>{fmtDateTime(o.opened_at)}</TD>
+                        <TD mono>{o.closed_at ? fmtDateTime(o.closed_at) : '—'}</TD>
+                        <TD mono align="right">{(o.items || []).length}</TD>
+                        <TD mono align="right" className="font-semibold text-slate-900">{fmtEUR(total)}</TD>
+                        <TD><StatusBadge status={o.status} /></TD>
+                      </TR>
+                    )
+                  })}
+                </tbody>
+              </DataTable>
+        )}
+
+        {/* Shifts tab */}
+        {tab === 'shifts' && (
+          shifts.length === 0
+            ? <div className="py-12 text-center text-slate-400 text-sm">Δεν βρέθηκαν βάρδιες</div>
+            : <DataTable>
+                <THead>
+                  <TH>Σερβιτόρος</TH>
+                  <TH>Έναρξη</TH>
+                  <TH>Λήξη</TH>
+                  <TH align="right">Διάρκεια</TH>
+                  <TH align="right">Εισπράχθηκαν</TH>
+                  <TH>Κατάσταση</TH>
+                  <TH className="w-20" />
+                </THead>
+                <tbody>
+                  {shifts.map(s => (
+                    <TR key={s.id} striped onClick={() => setDetailShift(s)} className="cursor-pointer">
+                      <TD><WaiterAvatar name={s.waiter_name} id={s.waiter_id} /></TD>
+                      <TD mono>{fmtDateTime(s.started_at)}</TD>
+                      <TD mono>{s.ended_at ? fmtDateTime(s.ended_at) : <span className="text-sky-600 font-medium">— ενεργή —</span>}</TD>
+                      <TD mono align="right">{fmtDuration(s.started_at, s.ended_at)}</TD>
+                      <TD mono align="right">{fmtEUR(s.total_collected)}</TD>
+                      <TD><StatusBadge status={s.is_active ? 'active' : 'closed'} pulse /></TD>
+                      <TD align="right">
+                        <div className="flex items-center justify-end gap-2">
+                          <button
+                            onClick={e => { e.stopPropagation(); setDetailShift(s) }}
+                            className="rounded border border-slate-200 bg-white px-2 py-0.5 text-[11px] font-medium text-slate-600 hover:bg-slate-50"
+                          >
+                            Λεπτομέρειες
+                          </button>
+                          {!s.is_active && (
+                            <button
+                              onClick={e => { e.stopPropagation(); onDeleteShift(s) }}
+                              className="rounded border border-red-200 bg-white p-0.5 text-red-400 hover:bg-red-50 hover:text-red-600"
+                              title="Διαγραφή βάρδιας"
+                            >
+                              <Trash2 size={13} />
+                            </button>
+                          )}
+                        </div>
+                      </TD>
+                    </TR>
+                  ))}
+                </tbody>
+              </DataTable>
+        )}
+      </DrillDownModal>
+
+      {drillOrder && (
+        <OrderDetailModal order={drillOrder} onClose={() => setDrillOrder(null)} />
+      )}
+
+      {detailShift && (
+        <ShiftDetailModal
+          shiftId={detailShift.id}
+          shiftWaiterId={detailShift.waiter_id}
+          onClose={() => setDetailShift(null)}
+        />
+      )}
+    </>
+  )
+}
+
+// ── Main page ───────────────────────────────────────────────────────────────
 export default function WorkDaySummary() {
   const [from, setFrom] = useState(monthAgo())
   const [to, setTo] = useState(today())
-  const [drillId, setDrillId] = useState(null)
+  const [drillDay, setDrillDay] = useState(null)
+  const [deleteDay, setDeleteDay] = useState(null)
+  const [deleteShift, setDeleteShift] = useState(null)
+
+  const qc = useQueryClient()
 
   const { data, isLoading, isError, refetch } = useQuery({
     queryKey: ['business-days', from, to],
     queryFn: () => client.get('/api/reports/business-days', { params: { from: from + 'T00:00:00', to: to + 'T23:59:59' } }).then(r => r.data),
-    staleTime: 60 * 1000,
+    staleTime: 0,
   })
 
-  const { data: drillData } = useQuery({
-    queryKey: ['business-day-orders', drillId],
-    queryFn: () => client.get('/api/reports/orders/history', { params: { business_day_id: drillId, page_size: 200 } }).then(r => r.data),
-    enabled: !!drillId,
-    staleTime: 60 * 1000,
+  const deleteDayMutation = useMutation({
+    mutationFn: (id) => client.delete(`/api/business-day/${id}`),
+    onSuccess: () => {
+      toast.success('Η εργάσιμη μέρα διαγράφηκε')
+      qc.invalidateQueries({ queryKey: ['business-days'] })
+      qc.invalidateQueries({ queryKey: ['business-days-list'] })
+      setDeleteDay(null)
+    },
+    onError: (err) => {
+      toast.error(err?.response?.data?.detail || 'Σφάλμα διαγραφής εργάσιμης μέρας')
+      setDeleteDay(null)
+    },
+  })
+
+  const deleteShiftMutation = useMutation({
+    mutationFn: (id) => client.delete(`/api/shifts/${id}`),
+    onSuccess: () => {
+      toast.success('Η βάρδια και οι παραγγελίες της διαγράφηκαν')
+      qc.invalidateQueries({ queryKey: ['shifts'] })
+      qc.invalidateQueries({ queryKey: ['shifts-for-day'] })
+      qc.invalidateQueries({ queryKey: ['business-days'] })
+      qc.invalidateQueries({ queryKey: ['business-days-list'] })
+      setDeleteShift(null)
+    },
+    onError: (err) => {
+      toast.error(err?.response?.data?.detail || 'Σφάλμα διαγραφής βάρδιας')
+      setDeleteShift(null)
+    },
   })
 
   const days = data?.business_days || []
-  const drillDay = drillId ? days.find(d => d.id === drillId) : null
-  const drillOrders = Array.isArray(drillData) ? drillData : []
 
   const chartData = [...days].reverse().map(d => ({
     date: fmtDate(d.opened_at),
@@ -90,10 +259,11 @@ export default function WorkDaySummary() {
                   <TH align="right">Ακυρώσεις</TH>
                   <TH align="right">Σερβιτόροι</TH>
                   <TH>Κατάσταση</TH>
+                  <TH className="w-10" />
                 </THead>
                 <tbody>
                   {days.map(d => (
-                    <TR key={d.id} onClick={() => setDrillId(d.id)} striped>
+                    <TR key={d.id} onClick={() => setDrillDay(d)} striped>
                       <TD className="font-medium text-slate-900">{fmtDate(d.opened_at)}</TD>
                       <TD mono>{fmtTime(d.opened_at)}</TD>
                       <TD mono>{d.closed_at ? fmtTime(d.closed_at) : '—'}</TD>
@@ -103,6 +273,18 @@ export default function WorkDaySummary() {
                       <TD mono align="right">{fmtNum(d.cancellation_count)}</TD>
                       <TD mono align="right">{fmtNum(d.waiter_count)}</TD>
                       <TD><StatusBadge status={d.status} pulse /></TD>
+                      <TD align="right">
+                        {d.status === 'closed' && (
+                          <button
+                            onClick={e => { e.stopPropagation(); setDeleteDay(d) }}
+                            className={`rounded border p-0.5 bg-white ${(d.shift_count ?? 0) === 0 ? 'border-red-200 text-red-400 hover:bg-red-50 hover:text-red-600' : 'border-slate-200 text-slate-300 cursor-not-allowed'}`}
+                            title={(d.shift_count ?? 0) === 0 ? 'Διαγραφή εργάσιμης μέρας' : `Έχει ${d.shift_count} βάρδιες — διαγράψτε τες πρώτα`}
+                            disabled={(d.shift_count ?? 0) > 0}
+                          >
+                            <Trash2 size={13} />
+                          </button>
+                        )}
+                      </TD>
                     </TR>
                   ))}
                 </tbody>
@@ -113,32 +295,29 @@ export default function WorkDaySummary() {
       </div>
 
       {drillDay && (
-        <DrillDownModal
-          title={`Εργάσιμη Μέρα · ${fmtDate(drillDay.opened_at)}`}
-          subtitle={`${drillOrders.length} παραγγελίες · ${fmtEUR(drillDay.revenue)} έσοδα`}
-          onClose={() => setDrillId(null)}
-        >
-          <DataTable>
-            <THead>
-              <TH>#</TH><TH>Τραπέζι</TH><TH>Άνοιξε</TH><TH>Έκλεισε</TH><TH align="right">Σύνολο</TH><TH>Κατάσταση</TH>
-            </THead>
-            <tbody>
-              {drillOrders.map(o => {
-                const total = (o.items || []).filter(i => ['active', 'paid'].includes(i.status)).reduce((s, i) => s + i.unit_price * i.quantity, 0)
-                return (
-                  <TR key={o.id} striped>
-                    <TD mono>#{o.id}</TD>
-                    <TD>{o.table_id}</TD>
-                    <TD mono>{fmtDate(o.opened_at)} {fmtTime(o.opened_at)}</TD>
-                    <TD mono>{o.closed_at ? fmtTime(o.closed_at) : '—'}</TD>
-                    <TD mono align="right" className="font-semibold">{fmtEUR(total)}</TD>
-                    <TD><StatusBadge status={o.status} /></TD>
-                  </TR>
-                )
-              })}
-            </tbody>
-          </DataTable>
-        </DrillDownModal>
+        <WorkDayModal
+          day={drillDay}
+          onClose={() => setDrillDay(null)}
+          onDeleteShift={s => setDeleteShift(s)}
+        />
+      )}
+
+      {deleteDay && (
+        <DeleteConfirmModal
+          title={`Διαγραφή Εργάσιμης Μέρας #${deleteDay.id}`}
+          description={`Η εργάσιμη μέρα της ${fmtDate(deleteDay.opened_at)} θα διαγραφεί μόνιμα. Δεν έχει βάρδιες.`}
+          onConfirm={() => deleteDayMutation.mutate(deleteDay.id)}
+          onCancel={() => setDeleteDay(null)}
+        />
+      )}
+
+      {deleteShift && (
+        <DeleteConfirmModal
+          title={`Διαγραφή Βάρδιας #${deleteShift.id}`}
+          description={`Η βάρδια του ${deleteShift.waiter_name} (${fmtDateTime(deleteShift.started_at)}) και ΟΛΕΣ οι παραγγελίες της θα διαγραφούν μόνιμα.`}
+          onConfirm={() => deleteShiftMutation.mutate(deleteShift.id)}
+          onCancel={() => setDeleteShift(null)}
+        />
       )}
     </div>
   )