Enable dragging from project panel to panes

Rework gpui2 drag API so that receivers need not specify the dragged view type.

co-authored-by: Max <max@zed.dev>
co-authored-by: Conrad <conrad@zed.dev>
8791f7cefcMikayla committed on 12/14/2023, 9:20:48 PM· committed by Max Brunsfeldparentc6e4468
9 files changedLine totals unavailable