feat: implement sharing

lib/types.ts

@@ -5,5 +5,17 @@ export interface Chat extends Record<string, any> {
   title: string
   createdAt: Date
   userId: string
+  path: string
   messages: Message[]
 }
+
+export interface Share {
+  id: string
+  title: string
+  createdAt: number
+  userId: string
+  path: string
+  chat: Chat
+}
+
+export type ServerActionResult<Result> = Promise<Result | Error>