feat(11.1-02): add agentInitialsData param to preparePdf and embed at agent-initials fields

- Add agentInitialsData as 6th optional param (default null)
- Embed agent initials PNG once before field loop (embed-once-draw-many pattern)
- Add agent-initials branch in field loop: drawImage at field coordinates
- Existing initials (client-initials) and agent-signature branches untouched

teressa-copeland-homes/src/lib/pdf/prepare-document.ts

@@ -24,6 +24,7 @@ export async function preparePdf(
   textFields: Record<string, string>,
   sigFields: SignatureFieldData[],
   agentSignatureData: string | null = null,
+  agentInitialsData: string | null = null,
 ): Promise<void> {
   const pdfBytes = await readFile(srcPath);
   const pdfDoc = await PDFDocument.load(pdfBytes);
@@ -36,6 +37,12 @@ export async function preparePdf(
     agentSigImage = await pdfDoc.embedPng(agentSignatureData);
   }
 
+  // Embed agent initials image once — reused across all agent-initials fields
+  let agentInitialsImage: PDFImage | null = null;
+  if (agentInitialsData) {
+    agentInitialsImage = await pdfDoc.embedPng(agentInitialsData);
+  }
+
   // Track which text field entries were successfully written via AcroForm so that
   // the fallback text stamp only shows entries that were NOT already embedded.
   const acroFilledKeys = new Set<string>();
@@ -152,6 +159,17 @@ export async function preparePdf(
         });
       }
       // If no signature saved: the prepare route guards against this with 422 before calling preparePdf
+
+    } else if (fieldType === 'agent-initials') {
+      if (agentInitialsImage) {
+        page.drawImage(agentInitialsImage, {
+          x: field.x,
+          y: field.y,
+          width: field.width,
+          height: field.height,
+        });
+      }
+      // If no initials saved: the prepare route guards against this with 422 before calling preparePdf
     }
   }