feat(12-01): PreviewModal component with react-pdf Document/Page

- 'use client' component accepting ArrayBuffer prop and onClose callback
- Configures pdfjs worker independently from PdfViewer module
- Imports AnnotationLayer.css and TextLayer.css
- Prev/Next page navigation with disabled states
- Fixed overlay (rgba black 70%) with white inner container

teressa-copeland-homes/src/app/portal/(protected)/documents/[docId]/_components/PreviewModal.tsx

@@ -0,0 +1,79 @@
+'use client';
+import { useState } from 'react';
+import { Document, Page, pdfjs } from 'react-pdf';
+import 'react-pdf/dist/Page/AnnotationLayer.css';
+import 'react-pdf/dist/Page/TextLayer.css';
+
+// Worker setup — configured independently from PdfViewer (separate module)
+pdfjs.GlobalWorkerOptions.workerSrc = new URL(
+  'pdfjs-dist/build/pdf.worker.min.mjs',
+  import.meta.url,
+).toString();
+
+interface PreviewModalProps {
+  pdfBytes: ArrayBuffer;
+  onClose: () => void;
+}
+
+export function PreviewModal({ pdfBytes, onClose }: PreviewModalProps) {
+  const [numPages, setNumPages] = useState(0);
+  const [pageNumber, setPageNumber] = useState(1);
+
+  return (
+    <div
+      style={{
+        position: 'fixed',
+        inset: 0,
+        background: 'rgba(0,0,0,0.7)',
+        zIndex: 50,
+        display: 'flex',
+        alignItems: 'center',
+        justifyContent: 'center',
+      }}
+    >
+      <div
+        style={{
+          background: 'white',
+          maxWidth: '900px',
+          width: '90vw',
+          maxHeight: '90vh',
+          overflowY: 'auto',
+          padding: '16px',
+        }}
+      >
+        {/* Navigation controls */}
+        <div className="flex items-center gap-3 text-sm mb-4">
+          <button
+            onClick={() => setPageNumber(p => Math.max(1, p - 1))}
+            disabled={pageNumber <= 1}
+            className="px-3 py-1 border rounded disabled:opacity-40 hover:bg-gray-100"
+          >
+            Prev
+          </button>
+          <span>{pageNumber} / {numPages || '?'}</span>
+          <button
+            onClick={() => setPageNumber(p => Math.min(numPages, p + 1))}
+            disabled={pageNumber >= numPages}
+            className="px-3 py-1 border rounded disabled:opacity-40 hover:bg-gray-100"
+          >
+            Next
+          </button>
+          <button
+            onClick={onClose}
+            className="ml-auto px-3 py-1 border rounded hover:bg-gray-100"
+          >
+            Close
+          </button>
+        </div>
+
+        {/* PDF renderer */}
+        <Document
+          file={pdfBytes}
+          onLoadSuccess={({ numPages }) => setNumPages(numPages)}
+        >
+          <Page pageNumber={pageNumber} />
+        </Document>
+      </div>
+    </div>
+  );
+}