feat(chat): message fork, edit and flowchat #1795

Job	Run time
Detect changes	6s
build web arm64	2m 44s
build workspace (debian) arm64	6s
build sparse amd64	4s
build web amd64	2m 45s
build server amd64	4m 59s
build server arm64	5m 2s
build workspace (debian) amd64	3s
build sparse arm64	6s
publish ${{ matrix.image }}${{ (((matrix.variant != '') && format(' ({0})', matrix.variant)) \|\| '') }}	-1s
	15m 54s

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