Add per-download Amazon button settings for current and archived downloads

src/App.tsx

@@ -281,6 +281,8 @@ interface DownloadPageResource {
   tags: string[]
   buttonText: string
   resourceId: string
+  amazonUrl?: string
+  amazonLabel?: string
 }
 
 function resolveDownloadPageResource(content: SiteContent, pageId: string | undefined): DownloadPageResource | null {
@@ -299,6 +301,8 @@ function resolveDownloadPageResource(content: SiteContent, pageId: string | unde
       tags: resource.tags ?? [],
       buttonText: `Download ${resource.label}`,
       resourceId: buildCustomResourceDownloadId(resource.id),
+      amazonUrl: resource.amazonUrl,
+      amazonLabel: resource.amazonLabel,
     }
   }
 
@@ -316,6 +320,8 @@ function resolveDownloadPageResource(content: SiteContent, pageId: string | unde
       tags: [],
       buttonText: `Download ${link.label || series.title || 'Resource'}`,
       resourceId: buildArchivedResourceDownloadId(series.id, link.id),
+      amazonUrl: link.amazonUrl,
+      amazonLabel: link.amazonLabel,
     }
   }
 
@@ -587,7 +593,7 @@ function StudyGuideSection({ content }: { content: SiteContent }) {
                 rel="noreferrer"
                 className="btn-secondary"
               >
-                Get Printed Copy on Amazon
+                {content.studyGuideAmazonButtonLabel || 'Get it on Amazon'}
               </a>
             </div>
           )}
@@ -819,6 +825,11 @@ function DownloadDetailPage({ content }: { content: SiteContent }) {
         </div>
 
         <div className="download-detail-actions">
+          {resource.amazonUrl && (
+            <a href={resource.amazonUrl} target="_blank" rel="noreferrer" className="btn-secondary">
+              {resource.amazonLabel || 'Get it on Amazon'}
+            </a>
+          )}
           <Link to="/resources" className="btn-secondary">Back to Downloads</Link>
         </div>
       </div>