introduce a session manager

src/services/session.ts

@@ -0,0 +1,13 @@
+export class Session {
+  static reset(): void {
+    localStorage.removeItem('token');
+  }
+
+  static setBearerToken(token: string): void {
+    localStorage.setItem('token', token);
+  }
+
+  static bearerToken(): string | null {
+    return localStorage.getItem('token');
+  }
+}