In his annual letter to shareholders, JPMorgan Chase & Co. CEO Jamie Dimon painted a picture of a bank thriving financially while navigating a turbulent global landscape. The letter, published Monday, underscores both the company's record-breaking performance and Dimon's cautionary notes and how they could reshape markets and investor expectations.JPMorgan reported $185.6 billion in revenue and $57 billion in net income, with a return on tangible common equity near 20 percent, reflecting the strength of its diversified operations across consumer lending, markets, wealth management and technology-enabled services. During the period, the bank increased its quarterly dividend twice, ultimately raising it…