Feature: Enable crossfading between tracks

[cdxker]

Description

Implement crossfading functionality to create smooth transitions between songs during playback.

Expected Behavior

• When one track ends, it fades out while the next track fades in
• Overlap duration should create a seamless listening experience
• Crossfade should work with auto-advance and manual skip

Tasks

• Implement audio fade out on ending track
• Implement audio fade in on incoming track
• Handle overlapping playback of two audio sources
• Add configurable crossfade duration setting
• Option to enable/disable crossfading

Open Questions

• Default crossfade duration? (e.g., 3-5 seconds)
• Should crossfade be skipped for certain transitions (e.g., user pressing previous)?

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