kitten diff: add support for sticky header #12891

Job	Run time
macOS Brew	4m 22s
Test ./dev.sh and benchmark	2m 6s
Bundle test (macos-latest)	3m 11s
Bundle test (ubuntu-latest)	1m 53s
Linux (python=3.12 cc=clang sanitize=1)	2m 26s
Linux (python=3.10 cc=gcc sanitize=0)	2m 0s
Linux (python=3.11 cc=gcc sanitize=1)	1m 52s
Linux package	4m 3s
	21m 53s

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