fix: TUI 进度条宽度自适应屏幕 (CSS width 100%)

transfer.py

@@ -698,6 +698,7 @@ from textual.widgets import (Footer, Header, Input, ProgressBar, RichLog,
 TUI_CSS = """
 Screen { layout: vertical; }
 #top { height: 7; border: round $primary; padding: 0 1; }
+#total-bar, #file-bar { width: 100%; }
 #stats-line { height: 1; content-align: left middle; }
 #chart-box { height: 6; border: round $secondary; padding: 0 1; }
 #speed-stats { height: 1; color: $text-muted; }