Revert "fix(#688): route expired auth sessions to sign-in (#689)" (#698)

This reverts commit a5baf41545.

app/src/main/java/com/m57/hermescontrol/data/local/AuthSessionState.kt

@@ -1,31 +0,0 @@
-package com.m57.hermescontrol.data.local
-
-import kotlinx.coroutines.flow.MutableStateFlow
-import kotlinx.coroutines.flow.StateFlow
-import kotlinx.coroutines.flow.asStateFlow
-
-/**
- * Single source of truth for app-wide auth session expiry latch.
- * When a REST call returns 401 (AuthExpired), [requireSignIn] is invoked,
- * triggering central navigation reset to [AuthLoginScreen] and WS disconnect.
- */
-object AuthSessionState {
-    private val _signInRequired = MutableStateFlow(false)
-    val signInRequired: StateFlow<Boolean> = _signInRequired.asStateFlow()
-
-    fun requireSignIn() {
-        _signInRequired.value = true
-    }
-
-    fun markAuthenticated() {
-        _signInRequired.value = false
-    }
-
-    fun clearSignInRequired() {
-        _signInRequired.value = false
-    }
-
-    fun resetForTest() {
-        _signInRequired.value = false
-    }
-}