Bump to TypeScript 5.6 /w strictPropertyInit #1485

Job	Run time
build-desktop (macos, development)	56s
build-docker (macos-13)	17m 37s
build-desktop (macos, production)	1m 7s
build-docker (ubuntu-latest)	47s
build-desktop (ubuntu, development)	1m 0s
build-web (macos, development)	1m 5s
build-desktop (ubuntu, production)	48s
build-web (macos, production)	1m 3s
build-desktop (windows, development)	2m 45s
build-web (macos, test)	1m 2s
build-desktop (windows, production)	3m 45s
build-web (ubuntu, development)	57s
build-web (ubuntu, production)	1m 19s
build-web (ubuntu, test)	57s
build-web (windows, development)	2m 55s
build-web (windows, production)	5m 40s
build-web (windows, test)	5m 54s
	49m 37s

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