style(raft): fix gci struct field alignment in node_test.go

gofmt/gci requires minimal alignment; excessive spaces in the
TestNewNode_SnapshotConfigApplied struct literal caused a lint failure.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: auricom

pkg/raft/node_test.go

@@ -128,9 +128,9 @@ func TestNodeResignLeader_NotLeaderNoop(t *testing.T) {
 
 func TestNewNode_SnapshotConfigApplied(t *testing.T) {
 	specs := map[string]struct {
-		cfg                        *Config
-		expectedSnapshotThreshold  uint64
-		expectedTrailingLogs       uint64
+		cfg                       *Config
+		expectedSnapshotThreshold uint64
+		expectedTrailingLogs      uint64
 	}{
 		"custom values applied": {
 			cfg: &Config{