Fix player pos

[oliverroick]

Two bug fixes with zooming and panning the spectrogram:

• Fix #34: The time indicator got misplaces in the spectrogram from zoom level 3 onwards because the formula to calculate the maximum pan thresholds on either side of the spectrogram was incorrect; allowing users to pan further.
• Fix #35: The panning stopped working after zooming out because the spectrogram centre could be outside the allowed pan threshold for the new zoom level; preventing the spectrogram to be panned at all. We're now resetting the spectrogram centre to the maximum or minimum allowed values.

[LanesGood]

I think this is properly fixing the two issues noted, but I'm not 100% certain. I still see two issues which may be separate and unrelated, but noting here in case these can/should be covered by the same fix.

Before diving too deeply into these, would it also be useful/beneficial to check out the wavesurfer playhead plugin, which indicates time and may also have the functionality required to mitigate these fixes by default?

1. When I click + drag on the spectrogram itself while the audio is playing, whether I'm zoomed in or out, I do see the time indicator moving back and forth.

https://github.com/developmentseed/bioacoustics-frontend/assets/12634024/63bcc30f-688c-4f72-891e-1bfddb2f17a8

2. When I zoom in, and then move my mouse to the spectrogram, it seems like the mouse is still in a "grab/drag" mode

https://github.com/developmentseed/bioacoustics-frontend/assets/12634024/03363b50-4d0a-4886-9997-a325c6a0f607

[oliverroick]

@LanesGood It's best to address these two issues separately from this work. I created tickets for both