add in-app prompt for system audio connection

src/i18n/locales/en.json

@@ -1214,6 +1214,10 @@
         "mainText": "drop a file here"
     },
     "visualizer": {
+        "systemAudioConsentAllow": "Allow",
+        "systemAudioConsentBody": "The visualizer requires access to the system audio to work",
+        "systemAudioConsentDecline": "Deny",
+        "systemAudioConsentTitle": "Allow access to system audio?",
         "systemAudioCaptureFailed": "Could not start capture: {{message}}",
         "systemAudioNoAudioTrack": "No audio track was returned. Ensure audio capture is enabled when prompted.",
         "visualizerType": "Visualizer Type",