The electric vehicle maker's sales unexpectedly jumped in September. Is this a turning point?Back in April, the unthinkable happened.Tesla (TSLA -4.58%) -- the world's largest car company by market cap, the biggest global manufacturer of electric vehicles (EVs), and the maker of the best-selling automobile on Earth in 2023 and 2024 -- posted a year-over-year quarterly delivery decline. Then in July, it happened again. So investors were bracing for another quarter of shrinking sales when Tesla released its Q ...