SoftBank's Vision Fund, the brainchild of the company's founder Masayoshi Son, has faced a number of headwinds including a slump in technology stocks as a result of rising interest rates, a tough China market and geopolitics.Kentaro Takahash | Bloomberg | Getty ImagesSoftBank posted a 724.3 billion Japanese yen ($4.6 billion) gain on its Vision Fund in the fiscal year ended March, the first time the flagship tech investment arm has been in the black since 2021.For the full fiscal year, SoftBank'...