fix(driver): fully clear session state on logout

[YLaxmikanth]

Description

Fixes a logout issue in the Driver App where authenticated screens remained accessible until application restart.

Changes Made

• Reset logout navigation using the root navigator
• Fully clear the authenticated shell route stack
• Redirect users to the login screen immediately after logout
• Added regression test covering logout behavior and back-navigation protection

Verification

• Logout now removes the authenticated shell from the navigation stack
• Protected screens are no longer accessible after logout
• Back navigation cannot return to authenticated routes
• Added widget test for logout flow

Closes KanishJebaMathewM#438

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[YLaxmikanth]

Closing this PR because it was accidentally opened against my fork instead of the upstream repository. I will open a new PR against KanishJebaMathewM/Truxify with the same changes.