Threads UX Polish Update

I recorded this short update to showcase the latest UI tweaks since my last video. I added a consistent hover‑on‑focus color, refined keyboard navigation to remember the cursor position (inspired by Linear), and enabled automatic scrolling when navigating long items like emails. I also switched to dark mode, discovered an unsightly selection color, and noted that it needs fixing. With these changes implemented, the interface is ready for review pending the dark‑mode selection fix.