패키지 버전 업데이트 및 SvelteKit 3, Tailwind CSS 4로 마이그레이션

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/service-worker/index.ts

@@ -1,15 +1,9 @@
-/// <reference no-default-lib="true"/>
-/// <reference lib="esnext" />
-/// <reference lib="webworker" />
-/// <reference types="@sveltejs/kit" />
-
+import { self } from "$app/service-worker";
 import { DECRYPTED_FILE_URL_PREFIX } from "./constants";
 import { decryptFile } from "./handlers";
 import { fileMetadataStore } from "./stores";
 import type { ServiceWorkerMessage, ServiceWorkerResponse } from "./types";
 
-const self = globalThis.self as unknown as ServiceWorkerGlobalScope;
-
 self.addEventListener("message", (event) => {
   const message: ServiceWorkerMessage = event.data;
   switch (message.type) {

src/service-worker/tsconfig.json

@@ -0,0 +1,8 @@
+{
+  "extends": "$app/tsconfig/service-worker",
+  "compilerOptions": {
+    "strict": true,
+    "noUncheckedIndexedAccess": true
+  },
+  "include": ["."]
+}