fix(ui): Improve metadata panel column spacing

Changed from HBox with spacer to GridWithColumns for better
column alignment. This prevents the right column (Video Codec,
etc.) from being pushed too far to the right edge.

main.go

@@ -9230,9 +9230,8 @@ Metadata: %s`,
 		makeRow("Metadata", metadata),
 	)
 
-	// Add spacing between the two columns
-	spacer := layout.NewSpacer()
-	twoColGrid := container.NewHBox(col1, spacer, col2)
+	// Two-column grid with proper spacing
+	twoColGrid := container.NewGridWithColumns(2, col1, col2)
 
 	// Combine filename row with two-column grid
 	info := container.NewVBox(fileRow, twoColGrid)