[client] Exclude UI fallback stubs from FreeBSD build

The _other.go fallback stubs in client/ui and client/ui/services matched
FreeBSD, dragging the Wails-importing services package into the FreeBSD
build and failing it (Wails v3 has no FreeBSD port). Add !freebsd (plus
!android/!ios/!js) to align them with the rest of these packages so the
whole UI is excluded on FreeBSD.

client/ui/recenter_other.go

@@ -1,4 +1,4 @@
-//go:build !linux || (linux && 386)
+//go:build (!linux || (linux && 386)) && !freebsd && !android && !ios && !js
 
 package main
 

client/ui/services/cursor_other.go

@@ -1,4 +1,4 @@
-//go:build !darwin && !windows && !linux
+//go:build !darwin && !windows && !linux && !freebsd && !android && !ios && !js
 
 package services
 

client/ui/tray_watcher_other.go

@@ -1,4 +1,4 @@
-//go:build !linux || (linux && 386)
+//go:build (!linux || (linux && 386)) && !freebsd && !android && !ios && !js
 
 package main