fix: YouTube soft-404 detection was matching all videos

The Contains(" - YouTube") check matched every valid video
since YouTube's standard title format is "Title - YouTube".
Changed to only match the exact title "YouTube" which is
what unavailable videos actually return. Also strip the
" - YouTube" suffix for cleaner display titles.

Author: stahnma

internal/handler/preview_youtube.go

@@ -24,12 +24,16 @@ func (h *Handler) GetYouTubePreview(targetURL string) (map[string]string, error)
 		return nil, fmt.Errorf("status 404")
 	}
 
-	// Make check more permissible using Contains
-	if strings.Contains(title, " - YouTube") || title == "YouTube" {
-		// Special handling for caller to know it's a 404
+	// Detect YouTube "soft 404": unavailable videos return a generic title
+	// like "YouTube" without the normal "Video Title - YouTube" format.
+	if title == "YouTube" {
 		return nil, fmt.Errorf("status 404")
 	}
 
+	// Strip the standard " - YouTube" suffix from the title
+	title = strings.TrimSuffix(title, " - YouTube")
+	meta["title"] = title
+
 	meta["type"] = "video"
 
 	return meta, nil