feat(bookmarks): classify URLs by type and adjust action buttons

- Add URL classification system (article, video, youtube, image)
- Classify based on domain (youtube) and file extensions
- Update button text: 'READ NOW' for articles, 'WATCH NOW' for videos, 'VIEW NOW' for images
- Update icons: faBookOpen for articles, faPlay for videos, faEye for images
- Apply classification to both individual URL buttons and main action button

src/utils/helpers.ts

@@ -10,4 +10,34 @@ export const extractNprofilePubkeys = (content: string): string[] => {
   return Array.from(unique)
 }
 
+export type UrlType = 'video' | 'image' | 'youtube' | 'article'
+
+export interface UrlClassification {
+  type: UrlType
+  buttonText: string
+}
+
+export const classifyUrl = (url: string): UrlClassification => {
+  const urlLower = url.toLowerCase()
+  
+  // Check for YouTube
+  if (urlLower.includes('youtube.com') || urlLower.includes('youtu.be')) {
+    return { type: 'youtube', buttonText: 'WATCH NOW' }
+  }
+  
+  // Check for video extensions
+  const videoExtensions = ['.mp4', '.webm', '.ogg', '.mov', '.avi', '.mkv', '.m4v']
+  if (videoExtensions.some(ext => urlLower.includes(ext))) {
+    return { type: 'video', buttonText: 'WATCH NOW' }
+  }
+  
+  // Check for image extensions
+  const imageExtensions = ['.jpg', '.jpeg', '.png', '.gif', '.webp', '.svg', '.bmp', '.ico']
+  if (imageExtensions.some(ext => urlLower.includes(ext))) {
+    return { type: 'image', buttonText: 'VIEW NOW' }
+  }
+  
+  // Default to article
+  return { type: 'article', buttonText: 'READ NOW' }
+}