feat(16-04): enrich dashboard rows with signedCount, totalSigners, hasMultipleSigners

- Import signingTokens and sql from drizzle-orm
- Add documents.signers to main select
- Fetch token counts per document in single grouped query (avoids N+1)
- Build tokenMap for O(1) lookup per row
- Produce enrichedRows with signedCount, totalSigners, hasMultipleSigners fields
- Pass enrichedRows to DocumentsTable instead of filteredRows

teressa-copeland-homes/src/app/portal/(protected)/dashboard/page.tsx

@@ -1,7 +1,7 @@
 import { auth } from "@/lib/auth";
 import { db } from "@/lib/db";
-import { documents, clients } from "@/lib/db/schema";
-import { eq, desc } from "drizzle-orm";
+import { documents, clients, signingTokens } from "@/lib/db/schema";
+import { eq, desc, sql } from "drizzle-orm";
 import { DocumentsTable } from "../../_components/DocumentsTable";
 import { DashboardFilters } from "../../_components/DashboardFilters";
 
@@ -25,16 +25,44 @@ export default async function DashboardPage({
       signedAt: documents.signedAt,
       clientName: clients.name,
       clientId: documents.clientId,
+      signers: documents.signers,
     })
     .from(documents)
     .leftJoin(clients, eq(documents.clientId, clients.id))
     .orderBy(desc(documents.createdAt));
 
+  // Fetch signing token counts per document in one query (avoids N+1)
+  const tokenCounts = await db
+    .select({
+      documentId: signingTokens.documentId,
+      total: sql<number>`count(*)`.as("total"),
+      signed: sql<number>`count(${signingTokens.usedAt})`.as("signed"),
+    })
+    .from(signingTokens)
+    .groupBy(signingTokens.documentId);
+
+  const tokenMap = new Map(
+    tokenCounts.map((t) => [
+      t.documentId,
+      { total: Number(t.total), signed: Number(t.signed) },
+    ])
+  );
+
   const filteredRows =
     status && (VALID_STATUSES as readonly string[]).includes(status)
       ? allRows.filter((r) => r.status === (status as ValidStatus))
       : allRows;
 
+  const enrichedRows = filteredRows.map((row) => {
+    const tc = tokenMap.get(row.id);
+    return {
+      ...row,
+      signedCount: tc?.signed ?? null,
+      totalSigners: tc?.total ?? null,
+      hasMultipleSigners: Array.isArray(row.signers) && row.signers.length > 0,
+    };
+  });
+
   const firstName = session?.user?.email?.split("@")[0] ?? "Agent";
 
   return (
@@ -51,7 +79,7 @@ export default async function DashboardPage({
           <span style={{ fontSize: "0.875rem", color: "#6B7280" }}>Filter by status:</span>
           <DashboardFilters currentStatus={status} />
         </div>
-        <DocumentsTable rows={filteredRows} showClientColumn={true} />
+        <DocumentsTable rows={enrichedRows} showClientColumn={true} />
       </div>
     </div>
   );