Out of memory crash for a file 100k lines 40mb

[WhiteNoise]

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Improve support for very large markdown files (greater than 1 MB)

Currently, there is no enforced hard cap on the maximum allowed single markdown file size. However, as the file gets larger, different problems start to become apparent. There are performance slowdowns, likely due to the indexing process, the automatic savings, file recovery snapshots, syncing frequency should also be fine tuned for these case. Beyond a certain point, large files can cause OOM problems, especially on mobile.