feat(eoi): signed-EOI hero + send-signed-copy; fix search dropdown z-order

- EOI tab: when an EOI is already signed and none is in flight, lead with a
  SignedEoiCard (preview + download + send-to-client) instead of the big
  "Generate EOI" empty state; quiet "Generate new EOI" remains for re-issue
- history rows + hero gain a "Send to client" action — POST
  /api/v1/documents/[id]/send-signed-copy emails the deal's client the
  finalized signed PDF (sendSignedCopyToClient reuses sendSigningCompleted),
  guarded by a confirm
- topbar: header gets z-30 so the global search dropdown paints above page
  content (charts/tables were bleeding through — header + main are sibling
  normal-flow boxes, so the dropdown's own z-50 couldn't win cross-context).
  Stays below the z-50 modal tier.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/lib/services/documents.service.ts

@@ -9,7 +9,7 @@ import {
   files,
 } from '@/lib/db/schema/documents';
 import { interests, interestBerths } from '@/lib/db/schema/interests';
-import { clients } from '@/lib/db/schema/clients';
+import { clients, clientContacts } from '@/lib/db/schema/clients';
 import { companies } from '@/lib/db/schema/companies';
 import { yachts } from '@/lib/db/schema/yachts';
 import { berths } from '@/lib/db/schema/berths';
@@ -1345,6 +1345,56 @@ async function sendCascadingInviteForNextSigner(doc: {
   }
 }
 
+/**
+ * Manually (re)send the finalized signed PDF of a completed document to the
+ * deal's client. Mirrors the automatic completion fan-out (sendSigningCompleted)
+ * but targets just the client recipient — backs the "Send signed copy to
+ * client" affordance on the EOI tab / document detail. Safe to call repeatedly.
+ */
+export async function sendSignedCopyToClient(
+  documentId: string,
+  portId: string,
+): Promise<{ recipientEmail: string }> {
+  const doc = await getDocumentById(documentId, portId);
+  if (doc.status !== 'completed' || !doc.signedFileId) {
+    throw new ValidationError('This document has no signed PDF to send yet.');
+  }
+  const owner = await resolveDocumentOwner(portId, doc);
+  if (!owner || owner.entityType !== 'client') {
+    throw new ValidationError('No client is linked to this document to send the signed copy to.');
+  }
+  const client = await db.query.clients.findFirst({
+    where: eq(clients.id, owner.entityId),
+    columns: { fullName: true },
+  });
+  // Primary email via the same is_primary-desc, created_at-desc picker the
+  // clients list uses, scoped to the email channel.
+  const [emailRow] = await db
+    .select({ value: clientContacts.value })
+    .from(clientContacts)
+    .where(and(eq(clientContacts.clientId, owner.entityId), eq(clientContacts.channel, 'email')))
+    .orderBy(desc(clientContacts.isPrimary), desc(clientContacts.createdAt))
+    .limit(1);
+  if (!emailRow?.value) {
+    throw new ValidationError('The linked client has no email address on file.');
+  }
+  const portRow = await db.query.ports.findFirst({
+    where: eq(ports.id, portId),
+    columns: { name: true },
+  });
+  await sendSigningCompleted({
+    portId,
+    portName: portRow?.name ?? 'Port Nimara',
+    recipients: [{ name: client?.fullName ?? '', email: emailRow.value }],
+    clientName: client?.fullName ?? doc.title,
+    documentLabel: DOC_TYPE_LABEL[doc.documentType] ?? 'Expression of Interest',
+    completedAt: new Date(),
+    signedPdfFileId: doc.signedFileId,
+    signedPdfFilename: `signed-${doc.id}.pdf`,
+  });
+  return { recipientEmail: emailRow.value };
+}
+
 // ─── Owner-wins resolution ────────────────────────────────────────────────────
 
 interface ResolvedOwner {