Add shared types for web workers

src/workers/worker.types.ts

@@ -0,0 +1,33 @@
+/**
+ * Shared types for Web Workers
+ */
+
+export interface StoreDefinition {
+  name: string;
+  options: IDBObjectStoreParameters;
+  indices: IndexDefinition[];
+}
+
+export interface IndexDefinition {
+  name: string;
+  keyPath: string | string[];
+  options: IDBIndexParameters;
+}
+
+export interface WorkerMessagePayload {
+  type: string;
+  payload?: any;
+  id: number;
+}
+
+export interface WorkerMessageResponse {
+  id: number;
+  type: 'SUCCESS' | 'ERROR';
+  result?: any;
+  error?: string;
+}
+
+export interface BatchWriteItem {
+  key?: IDBValidKey;
+  object: any;
+}