Why it matters
Replace entire JS libraries (Floating UI, Popper.js) with pure CSS — major DX and performance win.
Safari 18.4 completes cross-browser support. Tooltips, popovers, and floating UI without JavaScript are now possible natively.
Why it matters
Whole-repo context is the threshold where AI coding tools become actually useful for real work.
Copilot Workspace exits beta: plan → edit → test across entire repositories, not just single files.
Why it matters
If you touch any Python, uv is now the undisputed standard — learn it now.
Astral's Rust-based toolchain adds cross-platform lock files, workspace support, and `uv run` replacing virtualenv.