Dataset Management: Clear upload state on logout

[AkhileshNegi]

Is your feature request related to a problem?
Dataset upload state is not cleared upon logout, allowing the next user from a different organization to see the previous session's data. This leads to confusion and potential data exposure between users.

To Reproduce

1. Log in as a user in Organization 1.
2. Go to Datasets → Upload Dataset.
3. Select a CSV, enter a name, set a duplication factor (e.g. 5).
4. Log out.
5. Log in as a user in Organization 2 and open the Datasets / Upload screen.
6. The previous session’s file, name, and duplication factor (and dataset list) are still shown.

Expected behavior
After logout, all dataset state is cleared. Org 2 starts fresh — no pre-filled file, name, or duplication factor, and only Org 2’s datasets are visible.

[Ayush8923]

I rechecked this issue, and it no longer exists. Now, whenever a user logs out from any screen, they are automatically redirected to the default /chat page, so we don’t need to handle this separately anymore. additionally, unauthenticated users are no longer able to access protected routes.

This behavior was already fixed in the following PR: #243