Request: Split long posts between paragraphs instead of mid-sentence, where possible

[benjamineskola]

Current behaviour
A post that's too long for bluesky will be split. Splits occur between words (in splitTextBluesky). If the split point is mid-sentence it will split the sentence between two posts.

Desired behavior
If the post is split into paragraphs, split between paragraphs instead. (I would interpret a paragraph break as being two line breaks together, markdown-style: \n\n — however, it would probably also work just to split on line breaks.)

If it can't be split on paragraphs, fall back to the existing method.