feat(recording): toggle_microphone_mute command + recording://mic event

src-tauri/src/commands.rs

@@ -88,6 +88,7 @@ pub(crate) fn default_settings() -> Settings {
         mcp_expose: "none".into(),
         mcp_expose_recordings: false,
         auto_start: false,
+        close_to_tray: true,
     }
 }
 
@@ -1048,6 +1049,43 @@ pub async fn resume_recording(
     Ok(())
 }
 
+/// Toggle the microphone mute state for the active recording (FR-CAP-7): the
+/// mic channel goes silent (recording + live transcript + meter) while loopback
+/// keeps capturing. Bound to the "M" key in the UI. Returns the new muted state.
+/// Errors if this meeting was started with the mic off (nothing to mute).
+#[tauri::command]
+pub async fn toggle_microphone_mute(
+    app: AppHandle,
+    state: State<'_, AppState>,
+    meeting_id: MeetingId,
+) -> WaResult<bool> {
+    let guard = state.session.lock().await;
+    let session = guard
+        .as_ref()
+        .filter(|s| s.meeting_id == meeting_id)
+        .ok_or_else(|| WaError::new("recording", "no matching active recording"))?;
+    let mic = session
+        .mic_capture
+        .as_ref()
+        .ok_or_else(|| WaError::new("audio", "the microphone is off for this meeting"))?;
+    let muted = !mic.is_muted();
+    mic.set_muted(muted);
+    drop(guard);
+    let _ = app.emit(
+        "recording://mic",
+        serde_json::json!({ "meetingId": meeting_id, "muted": muted }),
+    );
+    crate::update_tray_tooltip(
+        &app,
+        if muted {
+            "WhispAssist — recording (mic muted)"
+        } else {
+            "WhispAssist — recording"
+        },
+    );
+    Ok(muted)
+}
+
 /// Toggle audio retention mid-meeting (ADR-0009, FR-REC-1).
 #[tauri::command]
 pub async fn set_recording_retention(