feat(storage): thread audio_layout through FinalizeMeeting + Meeting + get_meeting (FR-SPK)

src-tauri/src/storage/mod.rs

@@ -74,6 +74,10 @@ pub struct FinalizeMeeting {
     pub language: Option<String>,
     pub backend_used: Option<String>,
     pub model_used: Option<String>,
+    /// How `audio.wav`'s channels are laid out (FR-SPK/FR-CAP): `"split"` =
+    /// stereo mic-left/loopback-right, `"summed"`/`None` = mic mixed into every
+    /// channel. `None` leaves the stored value unchanged (e.g. on reprocess).
+    pub audio_layout: Option<String>,
 }
 
 /// Full meeting detail: DB row + transcript + speakers + notes (`get_meeting`'s
@@ -91,6 +95,10 @@ pub struct Meeting {
     pub language: Option<String>,
     pub backend_used: Option<String>,
     pub model_used: Option<String>,
+    /// `audio.wav` channel layout (FR-SPK/FR-CAP): `"split"` (mic-left /
+    /// loopback-right) or `"summed"`/`None` (mic mixed into every channel).
+    /// Diarization, playback downmix, and bundle export branch on it.
+    pub audio_layout: Option<String>,
     pub segments: Vec<TranscriptSegment>,
     pub speakers: Vec<SpeakerInfo>,
     pub notes_markdown: String,
@@ -742,7 +750,8 @@ impl Store for SqliteStore {
         let now = now_unix();
         sqlx::query(
             "UPDATE meetings SET status = 'ready', ended_at = ?, duration_secs = ?, recorded = ?,
-                language = ?, backend_used = ?, model_used = ?, updated_at = ? WHERE id = ?",
+                language = ?, backend_used = ?, model_used = ?,
+                audio_layout = COALESCE(?, audio_layout), updated_at = ? WHERE id = ?",
         )
         .bind(now)
         .bind(s.duration_secs)
@@ -750,6 +759,7 @@ impl Store for SqliteStore {
         .bind(&s.language)
         .bind(&s.backend_used)
         .bind(&s.model_used)
+        .bind(&s.audio_layout)
         .bind(now)
         .bind(id)
         .execute(&self.pool)
@@ -865,7 +875,7 @@ impl Store for SqliteStore {
 
     async fn get_meeting(&self, id: &MeetingId) -> Result<Meeting, StoreError> {
         let row = sqlx::query(
-            "SELECT id, title, started_at, ended_at, duration_secs, status, recorded, language, backend_used, model_used, calendar_event_id, template_id
+            "SELECT id, title, started_at, ended_at, duration_secs, status, recorded, language, backend_used, model_used, calendar_event_id, template_id, audio_layout
              FROM meetings WHERE id = ?",
         )
         .bind(id)
@@ -936,6 +946,7 @@ impl Store for SqliteStore {
             language: row.get("language"),
             backend_used: row.get("backend_used"),
             model_used: row.get("model_used"),
+            audio_layout: row.get("audio_layout"),
             segments,
             speakers,
             notes_markdown,
@@ -2031,6 +2042,7 @@ mod tests {
                     language: Some("fr".to_string()), // what auto-detect resolved to
                     backend_used: Some("cpu".to_string()),
                     model_used: Some("small-q5_1".to_string()),
+                    audio_layout: None,
                 },
             )
             .await
@@ -2074,6 +2086,7 @@ mod tests {
                     language: Some("en".to_string()),
                     backend_used: Some("cpu".to_string()),
                     model_used: Some("small-q5_1".to_string()),
+                    audio_layout: None,
                 },
             )
             .await