One companion study guide per series; v2.9.8

- Second series gets its own guide (Resources page card, download page, admin fields)
- When a series ends (scheduled or manual) its guide moves onto its Finished Book, which shows a guide button; the main series' guide is cleared unless the launch supplies a new one
- Lane B launch schedule can supply the incoming series' guide
- Download lookup covers second-series and finished-book guides; guide URLs are sanitized on save and on use

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/App.tsx

@@ -303,6 +303,33 @@ function resolveDownloadPageResource(content: SiteContent, pageId: string | unde
     }
   }
 
+  // Companion guide of the second series, or one kept on a finished book
+  const guideSource = pageId === 'second-guide'
+    ? { guide: content.secondSeries?.guide, imageUrl: content.secondSeries?.imageUrl, resourceId: 'guide:second' }
+    : pageId.startsWith('book-guide--')
+      ? (() => {
+          const book = (content.finishedBooks ?? []).find(item => item.id === pageId.slice('book-guide--'.length))
+          return { guide: book?.guide, imageUrl: book?.imageUrl, resourceId: `guide:book:${book?.id ?? ''}` }
+        })()
+      : null
+  if (guideSource) {
+    const guide = guideSource.guide
+    if (!guide?.title) return null
+    return {
+      id: pageId,
+      label: guide.title,
+      imageUrl: guideSource.imageUrl,
+      summary: guide.description || 'Complete the short form below and your download will start right away.',
+      tags: [],
+      buttonText: `Download ${guide.title}`,
+      resourceId: guideSource.resourceId,
+      amazonUrl: guide.amazonUrl,
+      amazonLabel: guide.amazonLabel,
+      appleBooksUrl: guide.appleBooksUrl,
+      appleBooksLabel: guide.appleBooksLabel,
+    }
+  }
+
   if (pageId.startsWith('custom--')) {
     const customId = pageId.slice('custom--'.length)
     const resource = (content.customLinks ?? []).find(link => link.id === customId && link.placement === 'resources')
@@ -824,7 +851,7 @@ function DownloadLibrarySection({ content }: { content: SiteContent }) {
     return !activeTag || (r.tags ?? []).includes(activeTag)
   })
 
-  if (!hasPrimaryGuide && resources.length === 0) return null
+  if (!hasPrimaryGuide && !content.secondSeries?.guide?.title && resources.length === 0) return null
 
   return (
     <section className="section-resources section-download-library" aria-label="Download library">
@@ -852,6 +879,29 @@ function DownloadLibrarySection({ content }: { content: SiteContent }) {
           </Link>
         )}
 
+        {content.secondSeries?.guide?.title && (
+          <Link to="/downloads/second-guide" className="resource-download-card resource-download-card--link resource-download-card--featured">
+            <div className="resource-download-header">
+              {content.secondSeries.imageUrl && (
+                <img
+                  src={content.secondSeries.imageUrl}
+                  alt={content.secondSeries.title}
+                  className="resource-link-image resource-link-image--featured"
+                  loading="lazy"
+                />
+              )}
+              <div className="resource-download-meta">
+                <div className="featured-badge">Featured</div>
+                <span className="resource-link-label">{content.secondSeries.guide.title}</span>
+                {content.secondSeries.guide.description && (
+                  <p className="resource-link-description">{content.secondSeries.guide.description}</p>
+                )}
+                <span className="resource-link-action">Download free guide →</span>
+              </div>
+            </div>
+          </Link>
+        )}
+
         {resources.length > 0 && (
           <>
             {allTags.length > 0 && (
@@ -1768,6 +1818,11 @@ function FinishedSeriesPage({ content }: { content: SiteContent }) {
                   📖 Study This Book
                 </Link>
               )}
+              {book.guide?.title && (
+                <Link to={`/downloads/book-guide--${book.id}`} className="finished-series-btn-download">
+                  📄 {book.guide.title}
+                </Link>
+              )}
             </div>
             {book.downloadQrUrl && book.downloadUrl && (
               <div className="finished-series-qr">