feat(mcp): customer_number on create_customer + Beta tags on webshop surfaces (#1677)

* feat(mcp): accept customer_number on gnubok_create_customer

Parity with gnubok_update_customer: a customer number no longer needs a
create-then-update two-step with two approvals. The staged params carry
the trimmed number, commitCreateCustomer inserts it, and the payload-size
ceiling is bumped 59.7K to 59.75K with a documented entry (the property
has no description; name + maxLength are the whole contract).

Requested by a user on Discord 2026-08-16.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* feat(ui): mark webshop integrations and orders tab as Beta

WooCommerce and Shopify rows on the import page get a quiet Beta chip
next to the title, and the webshop /orders sidebar item sets the
existing betaBadge flag. Chip recipe matches the nav beta badge so
Beta reads identically everywhere.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* fix(mcp): enforce customer_number invariants and show it on the approval card

Consolidated resolution pass for PR #1677:
- skeptic (correctness): maxLength 32 was advertisement-only on the create
  path; now enforced with a runtime guard in gnubok_create_customer execute
  (clean errors for non-string and >32) and a 400 guard in
  commitCreateCustomer, matching the web/v1 routes and commitUpdateCustomer.
- skeptic (correctness): CustomerPreview never rendered the staged
  customer_number, leaving the approver blind to the new field; added a
  conditional Kundnr row.
- CodeRabbit: reset the event bus in create-customer.test.ts beforeEach.
- Tests cover both new guards at the tool and executor layers.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

messages/en.json

@@ -7083,6 +7083,7 @@
     "stripe_description": "Connect your company's Stripe account to fetch payments, fees, and payouts continuously and book them against the Stripe balance.",
     "stripe_not_enabled_title": "The Stripe extension is not enabled",
     "stripe_not_enabled_description": "Enable the Stripe extension to connect your Stripe account and sync transactions automatically.",
+    "badge_beta": "Beta",
     "woocommerce_title": "WooCommerce",
     "woocommerce_description": "Connect your WooCommerce store to fetch paid orders and refunds into the transaction inbox.",
     "woocommerce_not_enabled_title": "The WooCommerce extension is not enabled",

messages/sv.json

@@ -7083,6 +7083,7 @@
     "stripe_description": "Koppla företagets Stripe-konto så hämtas betalningar, avgifter och utbetalningar löpande och bokförs mot Stripe-saldot.",
     "stripe_not_enabled_title": "Stripe-tillägget är inte aktiverat",
     "stripe_not_enabled_description": "Aktivera tillägget Stripe för att koppla ditt Stripe-konto och synka transaktioner automatiskt.",
+    "badge_beta": "Beta",
     "woocommerce_title": "WooCommerce",
     "woocommerce_description": "Koppla din WooCommerce-butik så hämtas betalda ordrar och återbetalningar till transaktionsinkorgen.",
     "woocommerce_not_enabled_title": "WooCommerce-tillägget är inte aktiverat",