fix: when you convert a block into checkListItem via inputRule, it should transfer its content into checkListItem content

[tmpluto]

Solved problem:
Put the cursor at the start of line and type "[] " to convert the block into checkListItem, but content of the block doesn't transfer into the checkListItem.

Screen.Recording.2026-01-04.at.09.17.55.mov

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Project	Deployment	Review	Updated (UTC)
blocknote	Ready	Preview	Jan 7, 2026 9:59am

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commit: 8715779

[nperez0111]

Thanks for this @tmpluto, good sleuthing on this fix