fix: address verified review findings (labels-milestones-time-1)

Signed-off-by: bircni <bircni@icloud.com>

internal/app/validation_test.go

@@ -70,7 +70,7 @@ func TestUsageErrorsPrecedeRequests(t *testing.T) {
 		{[]string{"issue", "list", "--page", "0"}, `"--page" flag: must be a positive integer`},
 		{[]string{"issue", "list", "--label", "bug, "}, "label names cannot be empty"},
 		{[]string{"label", "create", "--name", "bug", "--color", "wrong"}, "--color requires six hexadecimal digits"},
-		{[]string{"label", "edit", "1"}, "nothing to edit; pass a flag such as --title (see --help)"},
+		{[]string{"label", "edit", "1"}, "nothing to edit; pass a flag such as --name or --color (see --help)"},
 		{[]string{"label", "list", "--org", "team", "-R", "a/b"}, "--org and --repo are mutually exclusive"},
 		{[]string{"milestone", "close", " ", "--by-name"}, "milestone title or ID cannot be empty"},
 		{[]string{"milestone", "create", "--title", "v1", "--deadline", "invalid"}, "invalid --deadline"},