Market View: STI drops below 5,000 points after Budget 2026; Potential SGX-listed winners and losers from Budget 2026; Anthropic clinches US$380 billion valuation after US$30 billion funding round; Expectations on how Wall Street will open with US inflation data in focus, and with Trump reportedly planning to scale back some tariffs on steel, aluminium goods; iFast, Lum Chang to watch