Feature Request: Add dedup() method to Queue for removing duplicate tracks

[Icedwolf]

Is your feature request related to a problem? Please describe.

Yes. I often end up with multiple repeated tracks in the queue, especially when adding large playlists or re-adding the same playlist. It would be helpful to have a built-in way to clean up these duplicates quickly without manually removing each one.

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Describe the solution you'd like

I'd like to propose adding a dedup() method to the queue logic.

Proposed behavior:

• Keeps only the first occurrence of each track in the queue (based on URI).
• Adjusts the current track index if it shifts due to removals.
• Regenerates the shuffle order if shuffle mode is active, to ensure consistency.

Optionally:

• If the notify feature is enabled, send a notification indicating how many duplicate tracks were removed.

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Describe alternatives you've considered

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Additional context

I've already implemented this feature locally and would be happy to contribute it as a pull request if it's a good fit for the project.

Thanks for considering the request and for maintaining such a great project!