Harden drag/drop path handling and user feedback

main.go

@@ -3805,6 +3805,10 @@ func (s *appState) handleDropPlayer(items []fyne.URI) {
 	var videoPaths []string
 	for _, uri := range items {
 		path := uriPath(uri)
+		if path == "" {
+			logging.Debug(logging.CatModule, "drop received empty path; uri=%v", uri)
+			continue
+		}
 		logging.Debug(logging.CatModule, "drop received path=%s", path)
 
 		if info, err := os.Stat(path); err == nil && info.IsDir() {
@@ -3817,6 +3821,9 @@ func (s *appState) handleDropPlayer(items []fyne.URI) {
 
 	if len(videoPaths) == 0 {
 		logging.Debug(logging.CatUI, "no valid video files in dropped items")
+		fyne.Do(func() {
+			dialog.ShowInformation("No videos found", "Drop a video file or a folder containing videos.", s.window)
+		})
 		return
 	}
 
@@ -3837,6 +3844,14 @@ func uriPath(u fyne.URI) string {
 		return p
 	}
 	raw := u.String()
+	if raw == "" {
+		return ""
+	}
+	if parsed, err := url.Parse(raw); err == nil {
+		if parsed.Scheme == "file" {
+			return parsed.Path
+		}
+	}
 	if strings.HasPrefix(raw, "file://") {
 		raw = strings.TrimPrefix(raw, "file://")
 	}