feat(uat-b1): ship Wave A-E of Bucket 1 audit findings

Wave A (Interest+EOI form quick wins):
- Auto-select yacht after inline-create from interest form
- EOI generate dialog: "View EOI" action toast
- Interest form berth picker: formatBerthRange compact label
- Remove "Generate EOI" button from Documents tab (clean removal)
- Interest auto-assign: only sales_agent/sales_manager auto-claim
  ownership on create (explicit role check via user_port_roles join)
- LinkedBerthRowItem dims: drop "D" suffix + "L × W" format
- ExternalEoiUploadDialog: prefillSignatories prop threaded from
  active EOI signers
- EOI signature progress on Overview milestone card footer

Wave B (a11y + i18n sweeps):
- aria-live on supplemental-info error state
- text-[10px] -> text-xs in client-pipeline-summary
- Currency formatter: locale default removed (Intl uses runtime)
- en-US/en-GB hardcoded toLocaleString swept across 13 components

Wave C (Primary berth always in EOI bundle):
- Service guard strengthened on update path
- Migration 0083 backfills historical primary rows

Wave D (Onboarding super_admin discoverability):
- /api/v1/admin/onboarding/status endpoint + shared service
- Topbar OnboardingBanner (super_admin, session-dismissible)
- OnboardingTile dashboard widget (rail group, self-hides at 100%)
- Celebration toast + invalidate of shared status on last tick

Wave E (Branded post-completion email idempotency):
- Verified handleDocumentCompleted already owns the email fan-out
- Added regression test for the polling path + idempotency

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/components/reports/export-dashboard-pdf-button.tsx

@@ -65,7 +65,7 @@ export function ExportDashboardPdfButton({
 } = {}) {
   const { can } = usePermissions();
   const [open, setOpen] = useState(false);
-  const [title, setTitle] = useState(`Report - ${new Date().toLocaleDateString('en-GB')}`);
+  const [title, setTitle] = useState(`Report - ${new Date().toLocaleDateString(undefined)}`);
   const [selected, setSelected] = useState<PdfDashboardWidgetId[]>(
     PDF_DASHBOARD_WIDGETS.map((w) => w.id),
   );

src/components/reports/export-list-pdf-button.tsx

@@ -52,7 +52,7 @@ export function ExportListPdfButton({ kind, buttonLabel = 'Export PDF', defaultT
   const [open, setOpen] = useState(false);
   const [title, setTitle] = useState(
     defaultTitle ??
-      `${KIND_LABEL[kind].charAt(0).toUpperCase() + KIND_LABEL[kind].slice(1)} report - ${new Date().toLocaleDateString('en-GB')}`,
+      `${KIND_LABEL[kind].charAt(0).toUpperCase() + KIND_LABEL[kind].slice(1)} report - ${new Date().toLocaleDateString(undefined)}`,
   );
   const [includeArchived, setIncludeArchived] = useState(false);
   const [loading, setLoading] = useState(false);