feat(chunker): implement header tracking for Markdown tables during c… #349

Job	Run time
build-sandbox	19s
build-docreader	4m 1s
build-ui	28s
build-app (amd64, linux/amd64, ubuntu-latest)	5m 32s
build-app (arm64, linux/arm64, ubuntu-24.04-arm)	4m 35s
merge	20s
	15m 15s

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