fix(UX): multi-tab experience

[ankush]

If you get this error often, it's most likely because:

1. You have multiple tabs open
2. You get logged out in one tab and you login.
3. Other tabs don't know that this has happened.
4. Browser sends new SID cookie correctly but it has no way of knowing new CSRF token.
5. Problem auto resolves if you reload page.

Fix:

1. On booting new session update other tabs/workers in same browser to avoid "invalid requests".
2. On logging in as diff user - notify user to reload page.

Not going to force reload to avoid potential data loss.

Ref: https://developer.mozilla.org/en-US/docs/Web/API/BroadcastChannel