fix(overlay): stop Hyprland/Sway tracker polls from blocking the main thread (#289)

changes/tracker-async-poll.md

@@ -0,0 +1,5 @@
+type: fixed
+area: overlay
+
+- Hyprland and Sway window tracking no longer freezes the app when `hyprctl` or `swaymsg` is slow or hangs: polls now run in the background with a timeout and no longer pile up.
+- The Hyprland/Sway trackers read each mpv process's command line once instead of spawning `ps` on every poll.