新增空闲锁屏、修复401等问题，新增文件版本管理、共享库等占位符

frontend/src/store/auth.ts

@@ -47,6 +47,9 @@ export const useAuthStore = defineStore("auth", () => {
     login,
     fetchMe: fetchMeAction,
     logout,
+    setToken: (newToken: string) => {
+      token.value = newToken;
+    },
     requestReLogin: () => {
       forceLogin.value = true;
     },

frontend/src/store/session.ts

@@ -0,0 +1,55 @@
+import { defineStore } from "pinia";
+import { ref } from "vue";
+
+export type LockReason = "idle" | "extend_failed" | "token_invalid";
+
+export const useSessionStore = defineStore("session", () => {
+  const locked = ref(false);
+  const lockReason = ref<LockReason | null>(null);
+  const unlockAttempts = ref(0);
+  const lastUserActiveAt = ref(Date.now());
+  const lastNetworkActiveAt = ref(Date.now());
+  const lastExtendAt = ref(0);
+
+  const recordUserActivity = (ts: number = Date.now()) => {
+    lastUserActiveAt.value = ts;
+  };
+
+  const recordNetworkActivity = (ts: number = Date.now()) => {
+    lastNetworkActiveAt.value = ts;
+  };
+
+  const lock = (reason: LockReason) => {
+    locked.value = true;
+    lockReason.value = reason;
+  };
+
+  const unlock = () => {
+    locked.value = false;
+    lockReason.value = null;
+    unlockAttempts.value = 0;
+  };
+
+  const incrementUnlockAttempt = () => {
+    unlockAttempts.value += 1;
+  };
+
+  const setLastExtendAt = (ts: number) => {
+    lastExtendAt.value = ts;
+  };
+
+  return {
+    locked,
+    lockReason,
+    unlockAttempts,
+    lastUserActiveAt,
+    lastNetworkActiveAt,
+    lastExtendAt,
+    recordUserActivity,
+    recordNetworkActivity,
+    lock,
+    unlock,
+    incrementUnlockAttempt,
+    setLastExtendAt,
+  };
+});