Receipt fixes — Tax ID + print parity (prod)

6/6 prod checks green via test-receipt-fixes-prod.mjs. Tested by ringing one cash sale on Lumière demo data, capturing the rendered receipt HTML in the SuccessModal, then clicking Print and reading the iframe's srcdoc to confirm both surfaces carry the same self-contained markup.

Tax ID removed — khmer-receipt.tsx no longer renders the conditional Tax ID line. The taxId? field stays on the ReceiptData type for forward compat (region-specific receipts later, older orders).
Print = preview, pixel-for-pixel — root cause was that the print iframe captured innerHTML of the rendered receipt, which carried Tailwind class names (text-muted, font-extrabold, etc.) and styled-jsx hashed classes. Neither resolved inside the iframe document, which had no global stylesheet. Fix: refactored <KhmerReceipt> to use inline styles only. The rendered HTML is fully self-contained — same DOM renders identically anywhere.
Iframe stylesheet trimmed — openPrintWindow no longer pads or sizes the body. Only @page { size: 80mm auto } + the Inter / Noto Sans Khmer font fetch remain. The receipt root owns its own width (80mm) + padding (3mm).

All prod checks (6)

Login via Commerce SSO
Open shift + ring + pay → SuccessModal mounts with preview
Preview receipt has no "Tax ID" string
Preview receipt is fully self-contained (10+ inline style attributes, no Tailwind class names for layout, 80mm baked into inline width)
Print receipt → iframe srcdoc embeds the same receipt HTML as preview; @page rule kept; no body padding/width override in iframe <style> block
Cleanup

Regression sweep

Suite	Score	Status
test-receipt-fixes-prod (this bundle)	6/6	PASS
test-phase4-prod	10/10	PASS
test-phase1-prod	11/11	PASS
test-receipt-preview-prod	2/6	PRE-EXISTING (Phase 3)
Total receipt fixes + non-stale regression	27/27	PASS

The stale failures in test-receipt-preview-prod are the same Phase-3 landing-route regression as phase2-cafe-multishop + m1: the test navigates to /cafe/pos directly and looks for starter-open-shift, but Phase 3 (2026-05-07) routed Starter /cafe/pos to the lockable shell. Same fix pattern as test-phase4-prod — go to /cafe/pos?config=<id> instead. Tech-debt task; not from this push (commit 35a0dbb only touches the receipt component + print helper).

Code surface

nix-cafe (no backend touched, no DB migration):
  components/receipt/khmer-receipt.tsx       — drop Tax ID render; replace
                                                Tailwind utilities + styled-jsx
                                                with inline style props on every
                                                element. Inline tokens copied
                                                from globals.css (--muted #6B7280,
                                                --green-deep #3B6D11, --border
                                                #E5E7EB). Width 80mm + padding
                                                3mm baked into the paper root.
  lib/native-receipt.ts                       — print iframe body no longer pads
                                                or forces width. Only @page rule
                                                + font fetch remain in <head>.

Commit: 35a0dbb

Manual QA on a real printer

The DOM-equivalence check above proves the iframe document carries the
same self-contained markup as the preview. The remaining variable is the
printer's own rendering of that markup — recommend ringing one sale on
get-coffee and printing on the actual thermal printer to confirm:
  1. Receipt fills the 80mm thermal width (not narrow + centered)
  2. Khmer glyphs render correctly (Noto Sans Khmer font fetched OK)
  3. No Tax ID line below the rate row
  4. Visual order matches what you see in the in-app preview modal

Receipt fixes — Tax ID removal + print parity PROD

All prod checks (6)

Walkthrough screenshot

Regression sweep

Code surface

Manual QA on a real printer