Fixed: False disconnect alerts on startup
Accounts no longer trigger false "disconnected" notifications right after the app launches. The app now waits for a fresh heartbeat from each account before it starts watching for disconnects — with a 3-minute safety timeout to make sure accounts that are genuinely offline still get flagged.
Fixed: Removed accounts couldn't be re-added properly
Removing an account now fully deletes its settings instead of just hiding them. This means re-adding a previously removed account will work correctly and report status as expected.