Cafe follow-ups — skip-preview banner + daily report split (local)

11/11 + 10/10 = 21/21 local checks passed (this bundle + the receipt-preview test re-run after banner change).

Banner fast-path — LastOrderBanner drops the modal hop. Print button calls handlePrint which reads the receipt HTML from a hidden ref'd <KhmerReceipt> mount and hands it to the existing openPrintWindow iframe helper. Post-sale operators get a one-click print, just like before the modal landed yesterday.
Modal kept on /orders — ReceiptPreviewModal still imports + renders on app/(authed)/orders/starter-orders-client.tsx. The reprint-an-old-order flow benefits from the eyeballing step.
DAO split — DailyReportPayload now exposes totalLineDiscount + totalOrderDiscount alongside the combined totalDiscount (kept for callers that want one number, e.g. Telegram daily — though it doesn't currently consume this).
UI split — daily report Avg Ticket card shows two separate amber lines: "− $X line disc" and "− $Y order disc", each gated on its own > 0 check. Old metric-discount testid removed; new metric-discount-line + metric-discount-order testids added.
No regressions — typecheck clean (npx tsc --noEmit); /cafe/products /pos /orders /reports/daily all 307 cleanly; receipt-preview-local re-runs 10/10 with banner assertions updated.

All local checks (11)

A. Skip-preview on success banner

Register: ReceiptPreviewModal no longer imported on banner side
Register: KhmerReceipt + openPrintWindow imported for direct path
Register: LastOrderBanner has hidden receipt mount + Print=handlePrint
/orders still uses preview modal (regression — modal kept for older-order reprint)

B. Daily report — split totalDiscount

DAO: DailyReportPayload exposes totalLineDiscount + totalOrderDiscount
DAO: aggregateNativeDailyReport accumulates order vs line separately
UI: starter-daily-client renders metric-discount-line + metric-discount-order

Smoke regression

/cafe/products not 5xx
/cafe/pos not 5xx
/cafe/orders not 5xx
/cafe/reports/daily not 5xx

What's new — code surface

nix-cafe:
  app/(authed)/pos/starter-register-client.tsx              — banner skips modal: imports
                                                              KhmerReceipt + openPrintWindow,
                                                              hidden receipt mount, handlePrint
                                                              fires iframe print directly
  lib/db/orders.ts                                          — DailyReportPayload split,
                                                              aggregateNativeDailyReport returns
                                                              totalLineDiscount + totalOrderDiscount
                                                              + (combined) totalDiscount
  app/(authed)/reports/daily/starter-daily-client.tsx       — Avg Ticket card shows two lines

tests:
  test-cafe-followups-local.mjs                             — NEW (this bundle)
  test-receipt-preview-local.mjs                            — banner assertion flipped to
                                                              direct-print expectation

Gate 2 plan

1. Commit nix-cafe (single -m line) — only nix-cafe touched, no backend, no migrations.
2. Push → CF Pages auto-redeploys cafe Worker.
3. Update test-receipt-preview-prod.mjs to expect direct-print on banner (modal flow on /orders only).
4. Run new test-cafe-followups-prod.mjs against get-coffee:
   - Ring 1 product, pay → success banner shows Print
   - Click Print → openPrintWindow iframe spawned, NO preview modal opens
   - On /orders, click Print → preview modal still opens (regression)
   - Seed an order with both line + order discount, visit /reports/daily, assert
     metric-discount-line + metric-discount-order render with the right values
5. Regression sweep: receipt-preview + round 3 + round 2 + round 1 + R2.4b + 70.2 + phase1.
6. Publish prod gallery + ask for final approval.