fix: reload required after login

### Description
Currently the user requires to reload after login into the acc, if another session was live, they might need to reload to remove the prev acc from cache which is a major security and privacy vulnerability.

Start by tracing the login flow and how the active account or session cache is updated across the React frontend and Node.js backend. Reproduce the issue by switching accounts without reloading; done means the previous account's cached data is cleared immediately after login and no reload is required.

Written by the indexing model from the issue text.