Lexical version: 0.44.0

Steps To Reproduce

1. Apply the Page size or orientation settings
2. Switch to Markdown mode or HTML mode

Link to code example: https://playground.lexical.dev/#doc=H4sIAAAAAAAAE6VQPWvDMBD9L4-OqlGoSYq2Lp0DHksH1b7YAkVnzudQN-i_FzkppFtJp3tP3PvQnUFdUJZGvRLcGcKsZbZDiJ1Qgnv7I3k36IJQq4ETXJpjNDiwHL3CAQYhdZQUzhroMhIcRi--Fz8OMDiRTKtwY6D0qa9Xpb3QRpdYJMj3xPT02HLS8n6bdKfXfz3WE__-8UM5efFuSOexkKOXPqSpwA9W5SOcrWqDSAe9Qgn98IOVxxVlA5ZASf2lD0YWFR9K4OofvkqFlxo552wQ_aSNP1EHt9ntdtt6u7H2-WlrMPEsbdndR7_0wnPqbkvDVnVdWeRvOnCqm0ICAAA

The current behavior

The app is freezing

The expected behavior

The app shouldn't freeze

Impact of fix

I'm not sure what should happen when switching to Markdown, but for HTML mode, I think it would be right to export the page settings to a <meta> tag. For example:

<meta name="lexical-page" content="size=A4; orientation=portrait; margin=20mm">