Add Ko-fi integration: footer link, floating widget, and admin field; v1.1.46

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/content.ts

@@ -199,6 +199,7 @@ export interface SiteContent {
   platformAmazonUrl: string
   platformFacebookUrl: string
   platformCreatorUrl: string
+  platformKofiUrl?: string
   // ── Welcome Email ──
   welcomeEmailSubject: string
   welcomeEmailGreetingPrefix: string
@@ -416,6 +417,7 @@ export const DEFAULTS: SiteContent = {
   platformAmazonUrl: '/amazon',
   platformFacebookUrl: 'https://facebook.com/versebyversewithnate',
   platformCreatorUrl: 'https://creators.spotify.com/pod/profile/nmemmert/',
+  platformKofiUrl: 'https://ko-fi.com/versebyversewithnate',
   welcomeEmailSubject: 'Welcome to Verse by Verse with Nate',
   welcomeEmailGreetingPrefix: 'Glad you\'re here',
   welcomeEmailIntro: 'Thanks for subscribing to Verse by Verse with Nate - a Bible teaching podcast where we slow down, dig into the text, and pull out the nuggets God has for us word by word.',