fix(frontend): restore default session context store in vertical slice

frontend/src/spa/vertical-slice.ts

@@ -1,18 +1,15 @@
 import type { ApiClient } from '../api/client';
 import type { SessionDetailResponse } from '../api/types';
+import {
+  createSessionContextStore,
+  type SessionContext,
+  type SessionContextInput,
+  type SessionContextStore as PersistedSessionContextStore
+} from './session-context-store';
 
 export type AsyncState = 'idle' | 'loading' | 'success' | 'error';
 
-export interface SessionContext {
-  sessionCode: string;
-  playerToken: string;
-  nickname: string;
-}
-
-export interface SessionContextStore {
-  get(): SessionContext | null;
-  set(context: SessionContext): void;
-}
+export type SessionContextStore = Pick<PersistedSessionContextStore, 'get' | 'set'>;
 
 export interface VerticalSliceState {
   sessionCode: string;
@@ -30,14 +27,9 @@ export interface VerticalSliceController {
   startRound(sessionCode: string, categorySlug: string): Promise<VerticalSliceState>;
 }
 
-const NOOP_SESSION_CONTEXT_STORE: SessionContextStore = {
-  get: () => null,
-  set: () => undefined
-};
-
 export function createVerticalSliceController(
   api: ApiClient,
-  sessionContextStore: SessionContextStore = NOOP_SESSION_CONTEXT_STORE
+  sessionContextStore: SessionContextStore = createSessionContextStore()
 ): VerticalSliceController {
   const persistedContext = sessionContextStore.get();
 
@@ -96,11 +88,12 @@ export function createVerticalSliceController(
     state.joinState = 'success';
     state.sessionCode = normalizeCode(join.data.session.code || requestCode);
 
-    sessionContextStore.set({
+    const nextContext: SessionContextInput = {
       sessionCode: state.sessionCode,
-      playerToken: join.data.player.session_token,
-      nickname: join.data.player.nickname
-    });
+      playerId: join.data.player.id,
+      token: join.data.player.session_token
+    };
+    sessionContextStore.set(nextContext);
 
     return hydrateLobby(state.sessionCode);
   }
@@ -131,3 +124,5 @@ export function createVerticalSliceController(
     startRound
   };
 }
+
+export type { SessionContext };