Default FeaturePolicy does not allow microphone access preventing the transcribe recording feature to work on Chromium based browsers

[dhx]

Which version of assistant are you using?

2.3.0

Which version of Nextcloud are you using?

Nextcloud Hub 9 (30.0.5)

Which browser are you using? In case you are using the phone App, specify the Android or iOS version and device please.

Chrome 132.0.6834.110-1

Describe the Bug

While it works on Firefox, trying to start a recording with the "Transcribe audio" on a Chrome based browser leads to the following error message in the console:

[Violation] Permissions policy violation: microphone is not allowed in this document.
start @ ScheduledEmptyContent-Cj1Q5z8E.chunk.mjs:35
Qe @ index-BB8-ZDBS.chunk.mjs:3
a @ index-BB8-ZDBS.chunk.mjs:3
Qe @ index-BB8-ZDBS.chunk.mjs:3
e.$emit @ index-BB8-ZDBS.chunk.mjs:3
click @ index-BB8-ZDBS.chunk.mjs:13
Qe @ index-BB8-ZDBS.chunk.mjs:3
a @ index-BB8-ZDBS.chunk.mjs:3
Md.n._wrapper @ index-BB8-ZDBS.chunk.mjs:3

This seems to be caused by the default Nextcloud Feature-Policy disallowing microphone access which affects all supporting browsers: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Permissions-Policy#browser_compatibility

Guess something like this commit from the spreed repo should suffice:
nextcloud/spreed@ff71631

Expected Behavior

-> Microphone access should be requested in browsers supporting the feature-policy / permissions-policy header when trying to start a recording.

To Reproduce

-> Try to start a recording on an affected browser