Connection status is not always representative of actual connection

[lit-af]

When launching the UI. The status bar shows as connected.

Connection status should reflect actual connection status.

Present in the release Electron build v2.0.0 but not on the web version.

[IceSentry]

This happens because the entire app state is saved on close. We shouldn't save everything in localStorage, we should only save things like configurations made by the user.

see src/store/store.ts and src/store/localStorage.ts

[IceSentry]

#63 should fix this issue, but we should test with a real ROS connection to a robot

[IceSentry]

I will keep this issue open because there might still some inconsistencies between the real connection status and the one shown in the UI, but right now it always starts as disconnected when opening the app since the connection status is not persisted.