[lexical-playground] Feature: Table of Contents node #5810

Job	Run time
core-tests / integrity (24.x)	3m 35s
core-tests / unit (22.x)	1m 48s
core-tests / unit (24.x)	1m 32s
e2e-tests / canary (ubuntu-latest, 24.x, chromium, rich-text) / e2e-test	8m 35s
	15m 30s

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