refactor(tui): use strconv.Atoi in parseIntClamp, drop spurious error return

internal/tui/wizard/wizard_test.go

@@ -45,16 +45,18 @@ func TestRenderPlanEmpty(t *testing.T) {
 
 func TestParseIntClamp(t *testing.T) {
 	cases := map[string]int{
-		"":    1,
-		"  ":  1,
-		"abc": 1,
-		"0":   1,
-		"-5":  1,
-		"3":   3,
-		"12":  12,
+		"":     1,
+		"  ":   1,
+		"abc":  1,
+		"3abc": 1, // partial match is rejected (strconv.Atoi, not Sscanf)
+		"0":    1,
+		"-5":   1,
+		"3":    3,
+		"12":   12,
+		"99999999999999999999": 1, // overflow → fallback
 	}
 	for in, want := range cases {
-		got, _ := parseIntClamp(in, 1)
+		got := parseIntClamp(in, 1)
 		if got != want {
 			t.Errorf("parseIntClamp(%q) = %d, want %d", in, got, want)
 		}