Increase toolbar button spacing from 4 to 10

Sources/MiniPlayerApp.swift

@@ -290,8 +290,8 @@ struct ControlToolbar: View {
                     .frame(width: 45, alignment: .leading)
             }
             
-            // 按钮行 — 紧凑布局
-            HStack(spacing: 4) {
+            // 按钮行
+            HStack(spacing: 10) {
                 TB(icon: "folder") { bridge.openFileDialog(); onTouch() }
                 TB(icon: "link") { bridge.showURLDialog = true; onTouch() }
                 TB(icon: "qrcode.viewfinder") { bridge.showQRScannerWindow(); onTouch() }