regression: audio attachments show no duration and cannot seek until played

[KevLehman]

Proposed changes (including videos or screenshots)

Since the persistent audio player (#41120), message audio attachments render stateless controls against a single shared <audio> element. Duration and seek state only exist for the currently active track, so every unplayed audio message showed 0:00 and a locked slider (max = 0), and clicking the slider restarted playback from the beginning.

• Added useAudioDuration: loads the audio metadata off-DOM (preload='metadata') so each attachment knows its duration before ever being played, including the Infinity-duration workaround for MediaRecorder files (same behavior the previous per-message fuselage AudioPlayer had).
• AudioPlayerControls now falls back to that metadata duration when the track is not active, making the duration label and the slider range correct on render.
• play(track, at?): seeking an inactive attachment now starts playback at the clicked position (pending seek applied on loadedmetadata).

Issue(s)

Steps to test or reproduce

1. Send an audio message (or open a room with one).
2. Without playing it, the duration is shown and the slider is draggable.
3. Drag/click the slider on an unplayed audio: playback starts at that position.

Further comments

Client-only fix. Storing the duration in the attachment at upload time would avoid the extra metadata request and remains a possible follow-up.

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Codecov Report

❌ Patch coverage is 49.09091% with 28 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.63%. Comparing base (d59ea47) to head (3b692c1).

Additional details and impacted files

@@                Coverage Diff                @@
##           release-8.7.0   #41592      +/-   ##
=================================================
- Coverage          68.64%   68.63%   -0.02%     
=================================================
  Files               4138     4139       +1     
  Lines             159422   159471      +49     
  Branches           28179    28178       -1     
=================================================
+ Hits              109433   109449      +16     
- Misses             44852    44876      +24     
- Partials            5137     5146       +9     

Flag	Coverage Δ
e2e	58.90% <60.00%> (+0.02%)	⬆️
e2e-api	45.62% <ø> (+0.26%)	⬆️
unit	70.58% <18.18%> (-0.09%)	⬇️

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