refactor: Improve chunk merge/split logic and add validation #173

Job	Run time
build-docreader	5m 16s
build-ui	24s
build-app (amd64, linux/amd64, ubuntu-latest)	5m 17s
build-app (arm64, linux/arm64, ubuntu-24.04-arm)	7m 45s
merge	19s
	19m 1s

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