fix(fitness): mirror finish overview to other devices via SSE

Other devices were left on a blank active-workout page when one device
hit Finish. The finish broadcast now carries the saved session document,
and the receiving page builds the completion overview from it. If the
remote end-of-workout has no session payload (cancel, or the finishing
device couldn't post the session), receivers redirect to the workout
home instead of stranding on a blank page.

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "homepage",
-	"version": "1.69.3",
+	"version": "1.69.4",
 	"private": true,
 	"type": "module",
 	"scripts": {