how to cover haircracks in ceiling following leak...now fully dry

Get a stanley knife and clean out the cracks then use filler

Sound like its where the plasterboard sheets meet , if it is plasterboard. Opinions differ but I would have the whole lot skimmed and any cracks have tapped, the plasterer will do this. Have him tape along each crack and then some. Then decorate . If its an insurance job they would expect this to be done + decorated , if not you should have this done because you will only have to do it once. Best of luck tjh

Both above answers right.. if your going through insurance then the whole room should be done. If your doing it yourself then just rake out the cracks apply some stain block, fill & sand then re-dec... Good luck.