refactor(video): extract buildNativeVideoUrl to reusable utility (DRY)

src/utils/videoHelpers.ts

@@ -0,0 +1,36 @@
+/**
+ * Build native app deep link URL for video platforms
+ * Returns null if the platform doesn't have a known native app URL scheme
+ */
+export function buildNativeVideoUrl(url: string): string | null {
+  try {
+    const u = new URL(url)
+    const host = u.hostname
+    
+    if (host.includes('youtube.com')) {
+      const id = u.searchParams.get('v')
+      return id ? `youtube://watch?v=${id}` : `youtube://${u.pathname}${u.search}`
+    }
+    
+    if (host === 'youtu.be') {
+      const id = u.pathname.replace('/', '')
+      return id ? `youtube://watch?v=${id}` : 'youtube://'
+    }
+    
+    if (host.includes('vimeo.com')) {
+      const id = u.pathname.split('/').filter(Boolean)[0]
+      return id ? `vimeo://app.vimeo.com/videos/${id}` : 'vimeo://'
+    }
+    
+    if (host.includes('dailymotion.com') || host === 'dai.ly') {
+      const parts = u.pathname.split('/').filter(Boolean)
+      const id = host === 'dai.ly' ? parts[0] : (parts[1] || '')
+      return id ? `dailymotion://video/${id}` : 'dailymotion://'
+    }
+    
+    return null
+  } catch {
+    return null
+  }
+}
+