Adjust grid layout, optimize widget placement, and refine QR Code rendering logic

test/test.go

@@ -0,0 +1,16 @@
+package main
+
+import "fmt"
+
+func main() {
+	lines := []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}
+	length := (len(lines)) / 2
+	for i := range length {
+		fmt.Println("-")
+		fmt.Printf("%d=>%d\n", lines[i*2], lines[i*2+1])
+		fmt.Println("-")
+	}
+	if len(lines)%2 == 1 {
+		fmt.Printf("%d", lines[len(lines)-1])
+	}
+}