feat: player improvements

[jeppekroghitk]

Link to ticket

#7515

Description

Based on customer feedback, some changes to the player are needed to make it usable:

• Move away from using videotool iframe player.
• Rely on mp3 files only, to provide a HTML-based player with better controls.
• Save individual media progress.
• Draggable scrubber and loading animations.

Screenshot of the result

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Checklist

• My code is covered by test cases.
• My code passes our test (all our tests).
• My code passes our static analysis suite.
• My code passes our continuous integration process.

If your code does not pass all the requirements on the checklist you have to add a comment explaining why this change
should be exempt from the list.

Additional comments or questions

If you have any further comments or questions for the reviewer please add them here.

[jeppekroghitk]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.

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