Is it necessary to repeat the 'Isha prayer after purification if the blood flowed as a very thin, fine streak and then stopped, and the explicit blood flow did not occur until the following day?

If the bleeding returned after you saw purity, and the total blood was menstruation, then the thin streak was menstruation because it occurred within a time suitable for menstruation. The purity that intervenes during menstruation is a valid purity, during which prayer is obligatory and acts of worship are permissible. Based on this, you must make up all the prayers you performed or missed after seeing purity and before the bleeding returned, if you did not perform ghusl. This is the more cautious approach.