Initial ecommerce standalone package

src/features/ecommerce/ecommerceVideoKeepalive.ts

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+import type {
+  EcommerceVideoStage,
+  EcommerceVideoSceneTask,
+  EcommerceVideoPlanProgress,
+  EcommerceVideoPlanResult,
+  PlanStep,
+} from "./ecommerceVideoTypes";
+
+const KEEPALIVE_KEY = "omniai:ecommerce-video-workspace";
+
+interface EcommerceVideoKeepalive {
+  inputFingerprint: string;
+  stage: EcommerceVideoStage;
+  completedSteps: PlanStep[];
+  planResult: EcommerceVideoPlanResult | null;
+  planProgress?: EcommerceVideoPlanProgress | null;
+  scenes: EcommerceVideoSceneTask[];
+  sourceImageUrls: string[];
+  savedAt: number;
+}
+
+export function saveEcommerceVideoState(state: {
+  inputFingerprint: string;
+  stage: EcommerceVideoStage;
+  completedSteps: PlanStep[];
+  planResult: EcommerceVideoPlanResult | null;
+  planProgress?: EcommerceVideoPlanProgress | null;
+  scenes: EcommerceVideoSceneTask[];
+  sourceImageUrls?: string[];
+}): void {
+  try {
+    const entry: EcommerceVideoKeepalive = {
+      ...state,
+      sourceImageUrls: state.sourceImageUrls || [],
+      savedAt: Date.now(),
+    };
+    window.localStorage.setItem(KEEPALIVE_KEY, JSON.stringify(entry));
+  } catch {
+    // quota exceeded — silently drop
+  }
+}
+
+export function loadEcommerceVideoState(inputFingerprint: string): EcommerceVideoKeepalive | null {
+  try {
+    const raw = window.localStorage.getItem(KEEPALIVE_KEY);
+    if (!raw) return null;
+    const parsed = JSON.parse(raw) as EcommerceVideoKeepalive;
+    // Discard entries older than 2 hours
+    if (Date.now() - (parsed.savedAt || 0) > 2 * 60 * 60 * 1000) {
+      clearEcommerceVideoState();
+      return null;
+    }
+    if (parsed.inputFingerprint !== inputFingerprint) return null;
+    return parsed;
+  } catch {
+    return null;
+  }
+}
+
+export function clearEcommerceVideoState(): void {
+  try {
+    window.localStorage.removeItem(KEEPALIVE_KEY);
+  } catch {
+    // ignore
+  }
+}