fix(WebAudio): prevent position reset when seeking to duration

[Copilot]

• Analyze the issue: When seeking near the end of an audio track, playback jumps to the beginning
• Explore the codebase: Found the issue in both WebAudioPlayer and MediaElement backends
• Identify root causes:
  • WebAudio: The condition currentPos >= this.duration was resetting to 0 when position equaled duration
  • MediaElement: When media.ended is true and play(start, end) is called, the seek might not complete before play is invoked, causing the browser to restart from the beginning
• Implement fixes:
  • WebAudio: Changed >= to > so only positions strictly past the duration are reset
  • MediaElement: Added wait for 'seeked' event before calling play when media is ended
• Add unit tests for both scenarios
• Run linting and tests - all 320 tests pass
• Run security check - no vulnerabilities found

Original prompt

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This section details on the original issue you should resolve

<issue_title>When seeking near the end of an audio track, it always jumps back to the beginning and starts playback from the start position.</issue_title>
<issue_description><!--
BEFORE SUBMITTING:

• Please search in the existing issues to make sure this issue hasn't been reported already
• If you're not 100% certain if it's a bug in wavesurfer or your own code, please DO NOT create an issue and ask in the Q&A first: https://github.com/katspaugh/wavesurfer.js/discussions/categories/q-a
• The sections below are required to fill out. Bug reports without a minimal code snippet and other required information will be immediately closed.
  -->

Bug description

For example, with a 33-second audio clip, if playback reaches around the 31-second mark and you attempt to seek, it always automatically jumps back to the beginning and starts playing from the start. Even using the ws.play(start, end) method no longer works as expected.
https://github.com/user-attachments/assets/da3debc0-e9de-4788-8978-08abd47d8679

Environment

• Browser: Chrome
• Version: 7.10.1

Minimal code snippet

Expected result

Obtained result

Screenshots

</issue_description>

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

• Fixes When seeking near the end of an audio track, it always jumps back to the beginning and starts playback from the start position. #4282

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[katspaugh]

@copilot thanks for fixing it for WebAudio but the original issue didn't say specifically WebAudio, so I would assume they had the bug with the default media element playback.

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View logs

[Copilot]

@copilot thanks for fixing it for WebAudio but the original issue didn't say specifically WebAudio, so I would assume they had the bug with the default media element playback.

Added a fix for the default MediaElement backend in commit 4e7c1b4. When the media is ended and play(start, end) is called, we now wait for the 'seeked' event to fire before calling play(). This prevents the browser from restarting from the beginning when the seek hasn't completed yet.

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[katspaugh]

@AsherAla can you test if this branch solves the issue for you?