feat(assets): 使用 file-saver 库优化文件下载功能

- 引入 file-saver 库替代手动创建下载链接的方式
- 在 asset-transfer.ts 中使用 saveAs 替代 URL.createObjectURL 和手动点击链接
- 在 canvas-export.ts 中使用 saveAs 替代原有的文件下载逻辑
- 更新 package.json 添加 file-saver 依赖
- 更新 bun.lock 文件同步依赖变更

web/bun.lock

@@ -18,6 +18,7 @@
         "copy-to-clipboard": "^4.0.2",
         "dayjs": "^1.11.20",
         "fflate": "^0.8.3",
+        "file-saver": "^2.0.5",
         "localforage": "^1.10.0",
         "lucide-react": "^1.16.0",
         "motion": "^12.38.0",
@@ -34,6 +35,7 @@
       },
       "devDependencies": {
         "@tailwindcss/postcss": "^4",
+        "@types/file-saver": "^2.0.7",
         "@types/node": "^20",
         "@types/react": "19.1.12",
         "@types/react-dom": "19.1.9",
@@ -555,6 +557,8 @@
 
     "@types/debug": ["@types/debug@4.1.13", "https://registry.npmmirror.com/@types/debug/-/debug-4.1.13.tgz", { "dependencies": { "@types/ms": "*" } }, "sha512-KSVgmQmzMwPlmtljOomayoR89W4FynCAi3E8PPs7vmDVPe84hT+vGPKkJfThkmXs0x0jAaa9U8uW8bbfyS2fWw=="],
 
+    "@types/file-saver": ["@types/file-saver@2.0.7", "", {}, "sha512-dNKVfHd/jk0SkR/exKGj2ggkB45MAkzvWCaqLUUgkyjITkGNzH8H+yUwr+BLJUBjZOe9w8X3wgmXhZDRg1ED6A=="],
+
     "@types/hast": ["@types/hast@2.3.10", "https://registry.npmmirror.com/@types/hast/-/hast-2.3.10.tgz", { "dependencies": { "@types/unist": "^2" } }, "sha512-McWspRw8xx8J9HurkVBfYj0xKoE25tOFlHGdx4MJ5xORQrMGZNqJhVQWaIbm6Oyla5kYOXtDiopzKRJzEOkwJw=="],
 
     "@types/mdast": ["@types/mdast@3.0.15", "https://registry.npmmirror.com/@types/mdast/-/mdast-3.0.15.tgz", { "dependencies": { "@types/unist": "^2" } }, "sha512-LnwD+mUEfxWMa1QpDraczIn6k0Ee3SMicuYSSzS6ZYl2gKS09EClnJYGd8Du6rfc5r/GZEk5o1mRb8TaTj03sQ=="],
@@ -807,6 +811,8 @@
 
     "figures": ["figures@6.1.0", "https://registry.npmmirror.com/figures/-/figures-6.1.0.tgz", { "dependencies": { "is-unicode-supported": "^2.0.0" } }, "sha512-d+l3qxjSesT4V7v2fh+QnmFnUWv9lSpjarhShNTgBOfA0ttejbQUAlHLitbjkoRiDulW0OPoQPYIGhIC8ohejg=="],
 
+    "file-saver": ["file-saver@2.0.5", "", {}, "sha512-P9bmyZ3h/PRG+Nzga+rbdI4OEpNDzAVyy74uVO9ATgzLK6VtAsYybF/+TOCvrc0MO793d6+42lLyZTw7/ArVzA=="],
+
     "fill-range": ["fill-range@7.1.1", "https://registry.npmmirror.com/fill-range/-/fill-range-7.1.1.tgz", { "dependencies": { "to-regex-range": "^5.0.1" } }, "sha512-YsGpe3WHLK8ZYi4tWDg2Jy3ebRz2rXowDxnld4bkQB00cc/1Zw9AWnC0i9ztDJitivtQvaI9KaLyKrc+hBW0yg=="],
 
     "finalhandler": ["finalhandler@2.1.1", "https://registry.npmmirror.com/finalhandler/-/finalhandler-2.1.1.tgz", { "dependencies": { "debug": "^4.4.0", "encodeurl": "^2.0.0", "escape-html": "^1.0.3", "on-finished": "^2.4.1", "parseurl": "^1.3.3", "statuses": "^2.0.1" } }, "sha512-S8KoZgRZN+a5rNwqTxlZZePjT/4cnm0ROV70LedRHZ0p8u9fRID0hJUZQpkKLzro8LfmC8sx23bY6tVNxv8pQA=="],