fix(auth): align session lifecycle with Keycloak

src/store/authStore.ts

@@ -2,10 +2,27 @@ import { create } from "zustand";
 
 interface AuthState {
   accessToken: string | null;
+  sessionExpired: boolean;
+  sessionExpiryReason: "refresh_failed" | "session_max_age" | "unauthorized" | null;
   setAccessToken: (token: string | null) => void;
+  markSessionExpired: (
+    reason: Exclude<AuthState["sessionExpiryReason"], null>,
+  ) => void;
+  clearSessionExpired: () => void;
 }
 
 export const useAuthStore = create<AuthState>((set) => ({
   accessToken: null,
+  sessionExpired: false,
+  sessionExpiryReason: null,
   setAccessToken: (token) => set({ accessToken: token }),
+  markSessionExpired: (reason) => set({
+    accessToken: null,
+    sessionExpired: true,
+    sessionExpiryReason: reason,
+  }),
+  clearSessionExpired: () => set({
+    sessionExpired: false,
+    sessionExpiryReason: null,
+  }),
 }));