記住主題/模式/面板偏好,重開頁面自動還原

摘要：
與 claude-office 同步:深色模式、LIVE 模式與面板收合狀態
存入 localStorage,載入時自動套用。

根本原因：
偏好只存在記憶體 state,重整即重置。

影響：
使用者偏好跨重整保留;localStorage 不可用時安全降級。

修法：
同步 office-store.ts(loadPref/savePref)與 App.tsx(開機套用 mode)。

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/store/office-store.ts

@@ -71,25 +71,60 @@ interface OfficeState {
 
 let eventSeq = 0;
 
+/* UI preferences persisted across reloads. */
+function loadPref(key: string): string | null {
+  try {
+    return localStorage.getItem(key);
+  } catch {
+    return null;
+  }
+}
+
+function savePref(key: string, value: string) {
+  try {
+    localStorage.setItem(key, value);
+  } catch {
+    /* ignore */
+  }
+}
+
+const savedTheme = loadPref("office-theme");
+const savedPanel = loadPref("office-panel");
+
+/** Read the preferred data source ("live" | "sim"); the runtime applies it on boot. */
+export function loadPreferredMode(): "sim" | "live" {
+  return loadPref("office-mode") === "live" ? "live" : "sim";
+}
+
 export const useOfficeStore = create<OfficeState>()((set, get) => ({
   agents: new Map(),
   links: [],
   meetings: [],
   events: [],
   selectedAgentId: null,
-  theme: "light",
+  theme: savedTheme === "dark" ? "dark" : "light",
   paused: false,
   speed: 1,
   mode: "sim",
-  panelOpen: true,
+  panelOpen: savedPanel !== "0",
   clock: 0,
 
   selectAgent: (id) => set({ selectedAgentId: id }),
-  setTheme: (t) => set({ theme: t }),
+  setTheme: (t) => {
+    savePref("office-theme", t);
+    set({ theme: t });
+  },
   setPaused: (p) => set({ paused: p }),
   setSpeed: (s) => set({ speed: s }),
-  setMode: (m) => set({ mode: m }),
-  togglePanel: () => set((state) => ({ panelOpen: !state.panelOpen })),
+  setMode: (m) => {
+    savePref("office-mode", m);
+    set({ mode: m });
+  },
+  togglePanel: () =>
+    set((state) => {
+      savePref("office-panel", state.panelOpen ? "0" : "1");
+      return { panelOpen: !state.panelOpen };
+    }),
   clearWorld: () =>
     set({ agents: new Map(), links: [], meetings: [], events: [], selectedAgentId: null }),