Phase 4 — Pay/Close polish bundle (local)

17/17 local checks passed. Typecheck clean. Smoke routes (/pos, /products, /orders, /reports/daily) all under 500.

NIX-OS-78 — PayDialog cash-received now defaults to "". Cashier must type the actual amount tendered. Validate stays disabled with "Cash short — add more" until cash ≥ amount. Touched pay-dialog.tsx: initial split, updateSplit, total-resync effect, addSplit.
NIX-OS-79 — Close Shift dialog now offers "Other…" inline. Selecting it reveals a text input; on Confirm we call a new cashier-callable action createDiffReasonForCloseShiftAction (gated on nix_cafe.pos.session_close, not settings.edit) which creates a permanent active reason and uses the returned id. Both Pro CloseShiftDialog and Starter StarterCloseShiftDialog get the picker (Starter gained the picker for the first time).
NIX-OS-80 — Bank Count input removed from the Pro close dialog. Expected Cash formula switched from gross sales to cash-only sales (server pulls via existing sumCashPaymentsForSession, threaded through page → LockableShell as cashSalesTotal). Same fix applied to the CashMovementDialog "Drawer so far" card and the Telegram session-closed message. endingBank dropped from closeShiftAction param shape.
Post-order summary popup — Starter switched from auto-print banner to the same SuccessModal Pro uses, then the modal gained a summary card: items count + total + paid + change due, all above the Print button.
Searchable category dropdown — Native <select> in product-grid.tsx replaced with a popover combobox: trigger button → search input + filterable list. Esc / outside-click closes; Enter picks first match. "All categories" stays pinned.

All local checks (17)

NIX-OS-78 — initial split cashUsd defaults to empty
NIX-OS-78 — total-resync effect no longer touches cashUsd
NIX-OS-78 — switching method clears cash inputs
NIX-OS-79 — createDiffReasonForCloseShiftAction exists
NIX-OS-79 — Pro dialog renders Other option + text input
NIX-OS-79 — Starter dialog renders the same picker
NIX-OS-80 — Bank Count input removed from Pro dialog
NIX-OS-80 — Expected uses cashSalesTotal prop, not gross
NIX-OS-80 — page.tsx loads cashSalesTotal via DAO
NIX-OS-80 — closeShiftAction param shape drops endingBank
Post-order — Starter switched to modal successUx
Post-order — SuccessModal shows summary block
Category picker — popover with searchable list
/cafe/pos no 5xx (smoke)
/cafe/products no 5xx (smoke)
/cafe/orders no 5xx (smoke)
/cafe/reports/daily no 5xx (smoke)

Code surface

nix-cafe (no backend touched, no migrations):
  app/(authed)/pos/_components/pay-dialog.tsx                          — NIX-OS-78
  app/(authed)/pos/_components/success-modal.tsx                       — summary block
  app/(authed)/pos/_components/starter-register-mount.tsx              — successUx → "modal"
  app/(authed)/pos/_components/starter-close-shift-dialog.tsx          — NIX-OS-79 (parity)
  app/(authed)/pos/_components/starter-lockable-shell.tsx              — diffReasons pass-through
  app/(authed)/pos/_components/product-grid.tsx                        — CategoryPicker
  app/(pos-fullscreen)/pos/register/[configId]/page.tsx                — load cashSalesTotal + diffReasons
  app/(pos-fullscreen)/pos/register/[configId]/lockable-shell.tsx     — NIX-OS-79 + 80
  lib/actions/payment_diff_reasons.ts                                  — new cashier-callable action
  lib/actions/register.ts                                              — drop endingBank, fix Telegram cash math

Gate 2 plan

1. Single nix-cafe commit (one -m line). No backend changes, no DB migration.
2. Push origin karouna-dev → CF Pages auto-redeploys cafe Worker (~90s).
3. Run new test-phase4-prod.mjs:
   - Pro (get-coffee) + Starter (Lumière) both ring orders end-to-end
   - Assert Cash Received empty on Pay dialog open
   - Assert Validate disabled until cash typed
   - Assert SuccessModal shows summary block + change row
   - Assert close dialog: no Bank Count, Expected = cash-only, Other reason creates row
   - Assert category dropdown is the new popover combobox
4. Regression sweep: phase1 + phase2-sso-outdoor + phase2-cafe-multishop + m1 + nix-os-88
5. Publish phase4-prod gallery with regression table.

Phase 4 — Pay/Close polish bundle LOCAL

All local checks (17)

Code surface

Gate 2 plan

Note on Gate 1 verification depth