Character counter for Statuslog input

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Discussed in https://github.com/neatnik/omg.lol/discussions/298

^{Originally posted by kvanlierop October 21, 2022} It would be helpful to have a charter count (which counts down/up) on the status input form. This would help to know when we’re approaching a 280 character limit, which is important if porting over the status to Twitter or micro.blog.

Ideally, the character could would take into consideration the space which the emoji takes up as well as any truncated urls.