feat(discovery): capture virtual-meeting audio alongside the mic

CHANGELOG.md

@@ -13,6 +13,19 @@ _Feature module implementation (iam, billing, workspace, discovery) in progress.
 
 ### Added
 
+- **Discovery — virtual-meeting audio capture** (`feature/system-audio-capture`): the analyst can now
+  record a Zoom / Google Meet / Teams call, not only a face-to-face meeting. A compact **audio-source
+  picker** next to the record button chooses **In person (microphone)** or **Virtual meeting (microphone +
+  meeting audio)**, remembered per user in localStorage. The virtual source opens the browser's
+  screen-share picker straight from the record click (`getDisplayMedia` with tab/window/system audio, voice
+  processing off and ReqsAI's own tab hidden), drops the unused video track and mixes the shared audio with
+  the mic in one mono Web Audio mixer — the backend keeps receiving the same 16 kHz Int16 PCM on `/ws/stt`,
+  and the level meter shows the mix. Sharing without ticking "Share tab audio" warns and lets the user
+  retry; a dismissed picker stays idle silently; "Stop sharing" mid-session keeps recording the mic with a
+  notice and a **Share again** action in the session bar; pausing keeps the shared tab, so resuming never
+  re-opens the picker. The virtual option is disabled (with the reason) outside desktop Chrome/Edge, and a
+  hint recommends headphones to avoid a duplicated transcript (`discovery.source.*` plus new
+  `discovery.rec.*` / `discovery.bar.*` keys, en/es).
 - **Discovery — live session presence** (`feature/discovery-presence`): the discovery chat now shows who
   else is viewing the **live** session — an overlapping avatar stack with a live pulse, a "+N" overflow
   bubble and a viewer count, in both the page header and the live session bar. It is fed by a new

public/i18n/en.json

@@ -1082,20 +1082,34 @@
       "empty": "No language found.",
       "locked": "The language is fixed once recording starts."
     },
+    "source": {
+      "label": "Audio source",
+      "mic": "In person (microphone)",
+      "meeting": "Virtual meeting (microphone + meeting audio)",
+      "unsupported": "Virtual meeting: available in desktop Chrome or Edge.",
+      "hint": "When sharing, pick the meeting tab and tick \"Share tab audio\". Use headphones to avoid a duplicated transcript."
+    },
     "bar": {
       "recording": "Recording",
       "paused": "Paused",
       "pause": "Pause",
       "resume": "Resume",
-      "stop": "Stop"
+      "stop": "Stop",
+      "meetingAudio": "Recording microphone + meeting audio",
+      "meetingAudioLost": "Meeting audio is not being captured. Share the meeting tab again.",
+      "reshare": "Share again"
     },
     "rec": {
       "micDenied": "Microphone permission denied. Enable it in your browser settings.",
       "invalidUserSession": "Your user session is not valid.",
       "wsError": "Could not connect to the transcription server.",
       "wsClosed": "The transcription connection was closed.",
       "initFailed": "Could not start recording.",
-      "audioInitFailed": "Could not initialize the local audio processor."
+      "audioInitFailed": "Could not initialize the local audio processor.",
+      "noMeetingAudio": "No audio was shared. Pick the meeting tab and tick \"Share tab audio\".",
+      "meetingAudioEnded": "Meeting audio sharing stopped. Recording continues with the microphone only.",
+      "meetingUnsupported": "Your browser cannot capture meeting audio. Use desktop Chrome or Edge.",
+      "shareFailed": "Could not capture the selected tab, window or screen."
     },
     "queue": {
       "pendingBadge": "{{count}} suggestions pending",

public/i18n/es.json

@@ -1082,20 +1082,34 @@
       "empty": "No se encontró el idioma.",
       "locked": "El idioma queda fijo al iniciar la grabación."
     },
+    "source": {
+      "label": "Fuente de audio",
+      "mic": "Presencial (micrófono)",
+      "meeting": "Reunión virtual (micrófono + audio de la reunión)",
+      "unsupported": "Reunión virtual: disponible en Chrome o Edge de escritorio.",
+      "hint": "Al compartir, elige la pestaña de la reunión y marca «Compartir audio de la pestaña». Usa audífonos para no duplicar la transcripción."
+    },
     "bar": {
       "recording": "Grabando",
       "paused": "En pausa",
       "pause": "Pausar",
       "resume": "Reanudar",
-      "stop": "Detener"
+      "stop": "Detener",
+      "meetingAudio": "Grabando micrófono + audio de la reunión",
+      "meetingAudioLost": "No se está capturando el audio de la reunión. Vuelve a compartir la pestaña de la reunión.",
+      "reshare": "Compartir de nuevo"
     },
     "rec": {
       "micDenied": "Permiso de micrófono denegado. Habilítalo en los ajustes de tu navegador.",
       "invalidUserSession": "Tu sesión de usuario no es válida.",
       "wsError": "No se pudo conectar con el servidor de transcripción.",
       "wsClosed": "Se cerró la conexión de transcripción.",
       "initFailed": "No se pudo iniciar la grabación.",
-      "audioInitFailed": "No se pudo inicializar el procesador de audio local."
+      "audioInitFailed": "No se pudo inicializar el procesador de audio local.",
+      "noMeetingAudio": "No se compartió audio. Elige la pestaña de la reunión y marca «Compartir audio de la pestaña».",
+      "meetingAudioEnded": "Se dejó de compartir el audio de la reunión. La grabación continúa solo con el micrófono.",
+      "meetingUnsupported": "Tu navegador no puede capturar el audio de la reunión. Usa Chrome o Edge de escritorio.",
+      "shareFailed": "No se pudo capturar la pestaña, ventana o pantalla elegida."
     },
     "queue": {
       "pendingBadge": "{{count}} sugerencias pendientes",