fix: exports `client` and `theme` correctly

with types and js source

package.json

@@ -13,8 +13,14 @@
       "require": "./dist/node-cjs/index.cjs"
     },
     "./dist/client/*": "./dist/client/*",
-    "./client": "./client.d.ts",
-    "./theme": "./theme.d.ts"
+    "./client": {
+      "types": "./client.d.ts",
+      "default": "./dist/client/index.js"
+    },
+    "./theme": {
+      "types": "./theme.d.ts",
+      "default": "./dist/client/theme-default/index.js"
+    }
   },
   "bin": {
     "vitepress": "bin/vitepress.js"