feat: named registers, X/Z reports, daily rollup, fix drawerSessionId

Registers:
- New register table with location association
- CRUD service + API routes (POST/GET/PATCH/DELETE /registers)
- Drawer sessions now link to a register via registerId
- Register ID persisted in localStorage per device

X/Z Reports:
- ReportService with getDrawerReport() (X or Z depending on session state)
- Z report auto-displayed on drawer close in the drawer dialog
- X report (Current Shift Report) button on open drawer view
- Report shows: sales summary, payment breakdown, discounts, cash accountability, adjustments

Daily Rollup:
- ReportService.getDailyReport() aggregates all sessions at a location for a date
- New /reports/daily endpoint with locationId + date params
- Frontend daily report page with date picker, location selector, session breakdown

Critical Fix:
- drawerSessionId is now populated on transactions when completing (was never set before)
- This enables accurate per-drawer reporting and cash accountability

Migration 0044: register table, drawer_session.register_id column

Tests: 14 new (register CRUD, drawer report X/Z, drawerSessionId population, daily rollup, register-drawer link)
Full suite: 367 passed

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/admin/src/stores/pos.store.ts

@@ -13,6 +13,7 @@ type ReceiptFormat = 'thermal' | 'full'
 interface POSState {
   currentTransactionId: string | null
   locationId: string | null
+  registerId: string | null
   drawerSessionId: string | null
   locked: boolean
   cashier: POSUser | null
@@ -25,6 +26,7 @@ interface POSState {
   receiptFormat: ReceiptFormat
   setTransaction: (id: string | null) => void
   setLocation: (id: string) => void
+  setRegister: (id: string | null) => void
   setDrawerSession: (id: string | null) => void
   unlock: (user: POSUser, token: string) => void
   lock: () => void
@@ -45,7 +47,8 @@ function getStoredReceiptFormat(): ReceiptFormat {
 export const usePOSStore = create<POSState>((set) => ({
   currentTransactionId: null,
   locationId: null,
-  drawerSessionId: null,
+  registerId: localStorage.getItem('pos_register_id') ?? null,
+  drawerSessionId: localStorage.getItem('pos_drawer_session_id') ?? null,
   locked: true,
   cashier: null,
   token: null,
@@ -57,7 +60,8 @@ export const usePOSStore = create<POSState>((set) => ({
   receiptFormat: getStoredReceiptFormat(),
   setTransaction: (id) => set({ currentTransactionId: id }),
   setLocation: (id) => set({ locationId: id }),
-  setDrawerSession: (id) => set({ drawerSessionId: id }),
+  setRegister: (id) => { if (id) localStorage.setItem('pos_register_id', id); else localStorage.removeItem('pos_register_id'); set({ registerId: id }) },
+  setDrawerSession: (id) => { if (id) localStorage.setItem('pos_drawer_session_id', id); else localStorage.removeItem('pos_drawer_session_id'); set({ drawerSessionId: id }) },
   unlock: (user, token) => set({ locked: false, cashier: user, token, lastActivity: Date.now() }),
   lock: () => set({ locked: true, currentTransactionId: null }),
   touchActivity: () => set({ lastActivity: Date.now() }),