harden qobuz and downloader reliability edge cases

internal/provider/soundcloud/client.go

@@ -146,7 +146,7 @@ func (c *Client) searchPlaylists(ctx context.Context, query string, limit int) (
 		return nil, err
 	}
 
-	re := regexp.MustCompile(`/[A-Za-z0-9_-]+/sets/[A-Za-z0-9_-]+`)
+	re := regexp.MustCompile(`/(?:[A-Za-z0-9._-]+)/sets/(?:[A-Za-z0-9._%~-]+)`)
 	paths := re.FindAllString(string(body), -1)
 	if len(paths) == 0 {
 		return []map[string]any{}, nil
@@ -435,10 +435,11 @@ func canonicalSoundcloudURL(info map[string]any) string {
 			continue
 		}
 		host := strings.ToLower(strings.TrimPrefix(u.Host, "www."))
-		if host != "soundcloud.com" {
+		if host != "soundcloud.com" && !strings.HasSuffix(host, ".soundcloud.com") {
 			continue
 		}
 		u.Scheme = "https"
+		u.Host = "soundcloud.com"
 		u.RawQuery = ""
 		u.Fragment = ""
 		u.Path = strings.TrimSuffix(u.Path, "/")