Enable scrubbing on received voice messages

[jakewb-b]

As a user who has received a voice message
I want to be able to scrub the waveform
So that I can start playback from any point in the audio file

• Currently all voice messages play from the start, and there is no way to play them from a mid-point. This makes implementing longer messages a user-experience risk as it is too easy for users to lose their place in a file and not be able to easily regain it.
• There are two interactions:
  • Click on the waveform - move the playhead to that point
  • Click, drag, and release on the waveform - while dragging, the timecode should increase/decrease according to where the mouse is positioned, and on release the playhead moves to that point

[Johennes]

Closing this in favor of the duplicating #5426 which is linked to the PR.

[Johennes]

Or actually, let's keep it open since it's part of the Voice Messages Post-Launch project which I can't currently edit. Should be closed together with #5426 then.

[Johennes]

Closing in favor of #5426 after confirming with @jakewb-b