Add persistent Open in New Tab button to PDF viewer for reliability

Author: html-proof

src/components/common/PDFViewer.tsx

@@ -262,6 +262,32 @@ export default function PDFViewer({ fileUrl, fileName }: PDFViewerProps) {
                     >
                         <ZoomIn size={18} />
                     </button>
+
+                    {/* External Link Button - Always visible as fallback */}
+                    <a
+                        href={fileUrl}
+                        target="_blank"
+                        rel="noopener noreferrer"
+                        style={{
+                            padding: "0.5rem",
+                            background: "#e2e8f0",
+                            color: "#475569",
+                            border: "none",
+                            borderRadius: "4px",
+                            cursor: "pointer",
+                            display: "flex",
+                            alignItems: "center",
+                            textDecoration: "none",
+                            marginLeft: "0.5rem"
+                        }}
+                        title="Open in New Tab"
+                    >
+                        <svg xmlns="http://www.w3.org/2000/svg" width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
+                            <path d="M18 13v6a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h6"></path>
+                            <polyline points="15 3 21 3 21 9"></polyline>
+                            <line x1="10" y1="14" x2="21" y2="3"></line>
+                        </svg>
+                    </a>
                 </div>
             </div>