Added initial segment overlap resolution logic

internal/overlap/detect_test.go

@@ -132,7 +132,7 @@ func TestDetectIsIdempotent(t *testing.T) {
 func segment(source string, sourceIndex int, speaker string, start float64, end float64) model.Segment {
 	return model.Segment{
 		Source:             source,
-		SourceSegmentIndex: sourceIndex,
+		SourceSegmentIndex: intPtr(sourceIndex),
 		Speaker:            speaker,
 		Start:              start,
 		End:                end,
@@ -140,6 +140,10 @@ func segment(source string, sourceIndex int, speaker string, start float64, end
 	}
 }
 
+func intPtr(value int) *int {
+	return &value
+}
+
 func assertGroup(t *testing.T, merged model.MergedTranscript, groupIndex int, id int, start float64, end float64, refs []string, speakers []string) {
 	t.Helper()
 	if len(merged.OverlapGroups) <= groupIndex {