Add A-B loop playback for repeating song sections

[Copilot]

Implements section looping where users set start (A) and end (B) points to repeat a portion of the currently playing track.

Changes

Data Model (ABLoopState.cs)

• State object tracking start/end positions, iteration count, and enabled status
• Validates Point B > Point A

ViewModel (BaseViewModel.cs)

• SetPointA/BCommand: Capture current playback position as loop boundary
• ClearABLoopCommand: Reset loop state
• Loop detection in OnPositionChanged: Seeks to Point A when playback reaches Point B - 0.1s
• Auto-clears on song change

UI (HomePage.xaml)

• Three buttons: Set A, Set B, Clear (green borders when points set)
• Status label showing range and iteration count: "A-B Loop: 01:23 - 01:45 (3/infinite)"

Example Usage

// User clicks "Set A" at 01:23 during playback
SetPointACommand.Execute(null); // Captures CurrentTrackPositionSeconds

// User clicks "Set B" at 01:45
SetPointBCommand.Execute(null); // Enables loop, starts iteration count

// OnPositionChanged detects loop condition
if (positionSeconds >= ABLoopState.EndPosition.Value - 0.1) {
    ABLoopState.IncrementIteration();
    SeekTrackPosition(ABLoopState.StartPosition.Value);
}

Loop count defaults to infinite; can be extended later with UI controls for finite iterations.

Warning

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Original prompt

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This section details on the original issue you should resolve

<issue_title>we can add the possibility for a user to iterate a small part of a running music</issue_title>
<issue_description>Let’s imagine that we are listening to music, and suddenly a part of that music really grabs our attention. I think it would be fantastic to have a feature that allows us to extract that part and listen to it multiple times.
With this excerpt, we could choose to loop it several times (once, twice, etc.), or simply save it (creating music from music)."</issue_description>

Comments on the Issue (you are @copilot in this section)

@YBTopaz8 Interesting. Being able to loop , ONE part of a song🤔 Sort of having the option to choose point A then B, then apply and the song will only loop those until the user stops, Is that so?

• Fixes we can add the possibility for a user to iterate a small part of a running music #64

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