feat(ui): tag recording level events with mic vs system source (FR-CAP-7)

src/lib/api.ts

@@ -562,7 +562,7 @@ export const events = {
   onRetention: (cb: (p: { meetingId: string; record: boolean }) => void): Promise<UnlistenFn> =>
     listen("recording://retention", (e) => cb(e.payload as never)),
   onLevel: (
-    cb: (p: { meetingId: string; rms: number; peak: number }) => void,
+    cb: (p: { meetingId: string; rms: number; peak: number; mic: boolean }) => void,
   ): Promise<UnlistenFn> => listen("recording://level", (e) => cb(e.payload as never)),
   onDeviceChanged: (
     cb: (p: { meetingId: string; recovered: boolean; message: string }) => void,