Fix: [Regions] fix region dragging on played-over area

[katspaugh]

Short description

Resolves #3296

Clip-path was introduced in #3285 as a visual improvement but it broke region dragging past the progress line.

Implementation details

Instead of listening to mouse events on the canvases container, avoid the clip-path by listening to them on the wrapper container.

[cloudflare-workers-and-pages]

Deploying with    Cloudflare Pages

Latest commit:	1a7d400
Status:	✅  Deploy successful!
Preview URL:	https://14481958.wavesurfer-js.pages.dev
Branch Preview URL:	https://fix-clip.wavesurfer-js.pages.dev

View logs

[github-actions]

ESLint Summary View Full Report

Annotations are provided inline on the Files Changed tab. You can also see all annotations that were generated on the annotations page.

Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	1	N/A

• Result: ✅ success
• Annotations: 0 total

---

^{Report generated by eslint-plus-action}