feat: 电商页面 KeepAlive 保活机制，切换页面不再丢失生成状态

通过 display:none 模式实现轻量 KeepAlive，电商页面首次访问后保持挂载，
切换到其他页面再切回时所有右侧面板状态（上传图片、生成进度、结果）完整保留。
同时清理项目中的临时文件和本地冗余图片。

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/stores/useGenerationStore.ts

@@ -0,0 +1,121 @@
+import { create } from "zustand";
+import type { WebGenerationPreviewTask } from "../types";
+
+export type QueueItemStatus = "pending" | "running" | "completed" | "failed" | "cancelled";
+
+export interface GenerationQueueItem {
+  id: string;
+  taskId?: string;
+  title: string;
+  type: "image" | "video" | "agent" | "digital-human" | "character-mix" | "ecommerce-video";
+  status: QueueItemStatus;
+  progress: number;
+  prompt: string;
+  createdAt: number;
+  sourceView: string; // which page created this: "ecommerce", "workbench", "canvas", "agent"
+  resultUrl?: string | null;
+  error?: string | null;
+  params?: Record<string, unknown>;
+}
+
+interface PersistedQueueSnapshot {
+  version: 1;
+  items: GenerationQueueItem[];
+  savedAt: number;
+}
+
+const STORAGE_KEY = "omniai:generation-queue";
+const MAX_ITEMS = 80;
+const STALE_MS = 2 * 60 * 60 * 1000; // 2 hours
+
+function loadPersistedQueue(): GenerationQueueItem[] {
+  try {
+    const raw = localStorage.getItem(STORAGE_KEY);
+    if (!raw) return [];
+    const snapshot = JSON.parse(raw) as PersistedQueueSnapshot;
+    if (Date.now() - (snapshot.savedAt || 0) > STALE_MS) {
+      localStorage.removeItem(STORAGE_KEY);
+      return [];
+    }
+    return snapshot.items.filter(
+      (item) => item.status === "pending" || item.status === "running",
+    );
+  } catch {
+    return [];
+  }
+}
+
+function persistQueue(items: GenerationQueueItem[]): void {
+  try {
+    const snapshot: PersistedQueueSnapshot = { version: 1, items, savedAt: Date.now() };
+    localStorage.setItem(STORAGE_KEY, JSON.stringify(snapshot));
+  } catch { /* quota exceeded */ }
+}
+
+interface GenerationStoreState {
+  queue: GenerationQueueItem[];
+  addTask: (item: GenerationQueueItem) => void;
+  updateTask: (id: string, patch: Partial<GenerationQueueItem>) => void;
+  removeTask: (id: string) => void;
+  getRunningTasks: () => GenerationQueueItem[];
+  getPendingTasks: () => GenerationQueueItem[];
+  getTasksByView: (sourceView: string) => GenerationQueueItem[];
+  clearTerminal: () => void;
+}
+
+function hashUserId(): string {
+  try {
+    const raw = localStorage.getItem("omniai-web-session");
+    if (!raw) return "anon";
+    const parsed = JSON.parse(raw) as { user?: { id?: number | string } };
+    return String(parsed?.user?.id || "anon");
+  } catch {
+    return "anon";
+  }
+}
+
+const initialQueue = loadPersistedQueue();
+
+export const useGenerationStore = create<GenerationStoreState>((set, get) => ({
+  queue: initialQueue,
+
+  addTask: (item) => {
+    set((state) => {
+      const next = [item, ...state.queue].slice(0, MAX_ITEMS);
+      persistQueue(next.filter((i) => i.status === "pending" || i.status === "running"));
+      return { queue: next };
+    });
+  },
+
+  updateTask: (id, patch) => {
+    set((state) => {
+      const next = state.queue.map((item) =>
+        item.id === id ? { ...item, ...patch } : item,
+      );
+      persistQueue(next.filter((i) => i.status === "pending" || i.status === "running"));
+      return { queue: next };
+    });
+  },
+
+  removeTask: (id) => {
+    set((state) => {
+      const next = state.queue.filter((item) => item.id !== id);
+      persistQueue(next.filter((i) => i.status === "pending" || i.status === "running"));
+      return { queue: next };
+    });
+  },
+
+  getRunningTasks: () => get().queue.filter((i) => i.status === "running" || i.status === "pending"),
+  getPendingTasks: () => get().queue.filter((i) => i.status === "pending"),
+  getTasksByView: (sourceView) => get().queue.filter((i) => i.sourceView === sourceView),
+
+  clearTerminal: () => {
+    set((state) => {
+      const next = state.queue.filter(
+        (i) => i.status === "pending" || i.status === "running",
+      );
+      persistQueue(next);
+      return { queue: next };
+    });
+  },
+}));