feat(recording): RecordingSession.mic_activity for Phase 3 attribution (FR-SPK)

src-tauri/src/lib.rs

@@ -85,6 +85,13 @@ pub struct RecordingSession {
     /// auto-labeled "You" instead of a clustered "S1"/"S2". `None` when the
     /// mic is disabled (same conditions as `mic_capture`).
     pub mic_voice_sample: Option<Arc<audio::VoiceSample>>,
+    /// Phase 3 (FR-SPK): per-100ms timeline of when the mic (the user, "You")
+    /// was speaking, in `audio.wav` frame time. `stop_recording` turns it into
+    /// "You" spans and diarizes the far side with those ranges masked out, so
+    /// the mic is never clustered. `None` when the mic is disabled (same
+    /// conditions as `mic_capture`); then attribution falls back to the
+    /// voiceprint pass.
+    pub mic_activity: Option<Arc<audio::MicActivity>>,
     /// Live notes redesign: raw user-authored notes accumulated *during* the
     /// recording (freeform text + per-moment annotations) — see
     /// `models::ManualNotes`. Mutated by `update_live_notes`/`set_segment_note`