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

src/content.ts

@@ -5,6 +5,8 @@ export interface CustomLink {
   placement: 'platforms' | 'footer' | 'resources'
   imageUrl?: string
   description?: string
+  amazonUrl?: string
+  amazonLabel?: string
   tags?: string[]
 }
 
@@ -27,6 +29,8 @@ export interface ArchivedSeriesResourceLink {
   label: string
   description?: string
   url: string
+  amazonUrl?: string
+  amazonLabel?: string
 }
 
 export interface ArchivedSeriesNote {
@@ -140,6 +144,7 @@ export interface SiteContent {
   studyGuideDescription: string
   studyGuideDownloadUrl: string
   studyGuideUrl: string
+  studyGuideAmazonButtonLabel: string
   // ── Share ──
   shareHeading: string
   shareP: string
@@ -250,6 +255,7 @@ export const DEFAULTS: SiteContent = {
     'Go deeper in your study with the official Verse by Verse companion guide — now available on Amazon.',
   studyGuideDownloadUrl: '',
   studyGuideUrl: 'https://a.co/d/01sG2tOJ',
+  studyGuideAmazonButtonLabel: 'Get it on Amazon',
   shareHeading: 'Help one more person hear the Word this week.',
   shareP: 'Scan the QR code or text the show link to a friend who needs encouragement today.',
   whereToNextEyebrow: 'Where to Next',