refactor(diarization): expose first_appearance_order + build_name_map to crate (FR-SPK)

src-tauri/src/diarization/voiceprint.rs

@@ -110,8 +110,9 @@ pub fn match_mic_speaker(
 }
 
 /// Distinct speaker labels in first-appearance order — spans come back from
-/// the diarizer already sorted by start time.
-fn first_appearance_order(spans: &[SpeakerSpan]) -> Vec<String> {
+/// the diarizer already sorted by start time. `pub(crate)` so the Phase 3
+/// per-stream path can reuse it to name its merged You + far-side spans.
+pub(crate) fn first_appearance_order(spans: &[SpeakerSpan]) -> Vec<String> {
     let mut seen = std::collections::HashSet::new();
     spans
         .iter()
@@ -152,8 +153,12 @@ fn cosine_similarity(a: &[f32], b: &[f32]) -> f32 {
 
 /// `mic_label` -> "You"; every other label, in first-appearance order ->
 /// "Speaker 2", "Speaker 3", … (numbering starts at 2 — "You" stands in for
-/// "Speaker 1" without ever being called that).
-fn build_name_map(labels_in_order: &[String], mic_label: &str) -> HashMap<String, String> {
+/// "Speaker 1" without ever being called that). `pub(crate)` so Phase 3 reuses
+/// it for its merged You + far-side spans, keeping naming uniform app-wide.
+pub(crate) fn build_name_map(
+    labels_in_order: &[String],
+    mic_label: &str,
+) -> HashMap<String, String> {
     let mut names = HashMap::new();
     let mut next_speaker_number = 2;
     for label in labels_in_order {