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25104d1855
@tiptap/markdown parses via marked, whose tokenizer is O(n²) in document length. Opening a large markdown doc (issue description, agent instructions, …) froze the UI for tens of seconds: a 533KB plain-text doc took 61.8s to parse while the subsequent ProseMirror setContent was only 40ms. Upgrading marked doesn't help — already on 17.0.5, whose fix only covers `_`/`*` delimiter runs, not general prose. Parse large markdown in chunks instead of in one shot: split on blank lines outside fenced code blocks, parse each chunk independently, then concatenate the resulting docs. This drops marked's cost to O(n²/k) while producing a byte-identical document. Applied transparently at ContentEditor's two parse entry points (mount + WS-driven re-parse), gated at 50KB so normal small docs stay on the single-parse fast path. 533KB: parse 61.8s -> 0.95s (65x), open 100s -> 3.2s (31x). Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>