[feat] local backup functionality

package.json

@@ -20,8 +20,9 @@
     "@mlc-ai/web-tokenizers": "^0.1.2",
     "@smithy/protocol-http": "^3.0.10",
     "@smithy/signature-v4": "^2.0.16",
-    "@tauri-apps/api": "1.4.0",
+    "@tauri-apps/api": "1.5.1",
     "@types/marked": "^5.0.2",
+    "@types/streamsaver": "^2.0.4",
     "@xenova/transformers": "^2.9.0",
     "blueimp-md5": "^2.19.0",
     "body-parser": "^1.20.2",
@@ -54,6 +55,7 @@
     "rollup": "^3.29.4",
     "showdown": "^2.1.0",
     "sortablejs": "^1.15.0",
+    "streamsaver": "^2.0.6",
     "three": "^0.154.0",
     "tippy.js": "^6.3.7",
     "uuid": "^9.0.1",
@@ -64,7 +66,7 @@
   "devDependencies": {
     "@sveltejs/vite-plugin-svelte": "^2.5.3",
     "@tailwindcss/typography": "^0.5.10",
-    "@tauri-apps/cli": "1.4.0",
+    "@tauri-apps/cli": "1.5.7",
     "@tsconfig/svelte": "^3.0.0",
     "@types/blueimp-md5": "^2.18.2",
     "@types/dompurify": "^3.0.5",