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>

app/(dashboard)/import/page.tsx

@@ -2464,6 +2464,7 @@ export default function ImportPage() {
                   <ImportRow
                     title={t('woocommerce_title')}
                     sub={t('woocommerce_description')}
+                    chip={<BetaChip label={t('badge_beta')} />}
                     chips={<LogoChip src="/logos/woocommerce.svg" name="WooCommerce" />}
                     disabled={woocommerceDisabled}
                     onClick={() => setMode('woocommerce')}
@@ -2473,6 +2474,7 @@ export default function ImportPage() {
                   <ImportRow
                     title={t('shopify_title')}
                     sub={t('shopify_description')}
+                    chip={<BetaChip label={t('badge_beta')} />}
                     chips={<LogoChip src="/logos/shopify.svg" name="Shopify" />}
                     disabled={shopifyDisabled}
                     onClick={() => setMode('shopify')}
@@ -2776,6 +2778,16 @@ function ImportRow({
   )
 }
 
+// Same quiet beta-badge recipe as the sidebar nav (DashboardNav renderBadge),
+// so "Beta" reads identically wherever it appears.
+function BetaChip({ label }: { label: string }) {
+  return (
+    <span className="rounded-full bg-muted/60 px-1.5 py-0.5 text-[9px] font-medium uppercase tracking-wider text-muted-foreground/70">
+      {label}
+    </span>
+  )
+}
+
 // Provider mark chip (same recipe as the pre-migration live page): tiny logo
 // on a quiet bordered chip, so integrations read as first-class brands.
 // `mono` is for light-on-transparent marks (Enable Banking): the marketing