* fix(#688): route expired auth sessions to sign-in
Adopt global 401 latch, WS disconnect, and Back/profile guards.
* chore: clean up formatting noise
* fix(ktlint): reorder imports to place java and kotlinx at end
* fix(ktlint): place java.io.IOException at end of imports
* test: fix NavBackStack type parameter in AuthenticationRoutingTest
* test: add AuthSessionState tests to AuthLoginViewModelTest
* fix(ktlint): fix import order in AuthLoginViewModelTest
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