Streaming Gemini API Responses in Rust + Tauri — Real-Time Token Display

If this is useful, a ❤️ helps others find it. All tests run on an 8-year-old MacBook Air. Waiting 5 seconds for an AI response with no feedback feels broken. Streaming fixes this — tokens appear as they're generated, just like ChatGPT. Here's how to wire Gemini streaming into a Tauri app so the resp