Build fails with rolldown:vite-resolve, messages not exported under conditions

### Reporting a bug?

In `dev` mode everything works fine, but when trying to build using `vite build`, I get the following error:

Error message from vite build

```bash
error during build:
Build failed with 1 error:

[rolldown:vite-resolve] plugin `rolldown:vite-resolve` threw an error

Caused by:
"./messages" is not exported under the conditions ["module", "browser", "production", "import"] from package /project-folder-path/node_modules/@intlify/unplugin-vue-i18n (see exports field in /project-folder-path/node_modules/@intlify/unplugin-vue-i18n/package.json)

at aggregateBindingErrorsIntoJsError (file:///project-folder-path/node_modules/rolldown/dist/shared/error-BzLGqhSQ.mjs:48:18)
at unwrapBindingResult (file:///project-folder-path/node_modules/rolldown/dist/shared/error-BzLGqhSQ.mjs:18:128)
at #build (file:///project-folder-path/node_modules/rolldown/dist/shared/rolldown-I5b6h5Km.mjs:132:34)
at async buildEnvironment (file:///project-folder-path/node_modules/vite/dist/node/chunks/node.js:33669:66)
at async Object.build (file:///project-folder-path/node_modules/vite/dist/node/chunks/node.js:34091:19)
at async buildSW (file:///project-folder-path/node_modules/vite-plugin-pwa/dist/vite-build-BGK4YAIU.js:22:3)
at async generateInjectManifest (file:///project-folder-path/node_modules/vite-plugin-pwa/dist/index.js:224:3)
at async _generateSW (file:///project-folder-path/node_modules/vite-plugin-pwa/dist/index.js:232:5)
at async PluginContextImpl.handler (file:///project-folder-path/node_modules/vite-plugin-pwa/dist/index.js:427:13)
at async plugin (file:///project-folder-path/node_modules/rolldown/dist/shared/bindingify-input-options-CMab5gbt.mjs:1721:3) {
errors: [Getter/Setter],
code: 'PLUGIN_ERROR',
plugin: 'vite-plugin-pwa:build',
hook: 'closeBundle'
}
```

Is there a conflict with the `vite-plugin-pwa` package?

### Expected behavior

No build errors and working as in development mode.

### Reproduction

Below the messages are imported:
```typescript
// i18n.ts
import messages from '@intlify/unplugin-vue-i18n/messages'

export const createCustomI18n = (locale?: string) => createI18n({
locale: navigator.language,
messages,
legacy: false,
globalInjection: true,
});
```

The following options are set on the plugin in vite.config.ts:
```typescript
// vite.config.ts
import VueI18nPlugin from '@intlify/unplugin-vue-i18n/vite'

export default defineConfig({
plugins: [
VueI18nPlugin({
include: [path.resolve(import.meta.dirname, 'src/locales/**')],
treeShaking: true,
})
]
})
```

### Issue Package

vite-plugin-vue-i18n

### System Info

```shell
System:
OS: Linux 6.8 Ubuntu 24.04.4 LTS 24.04.4 LTS (Noble Numbat)
CPU: (8) x64 Intel(R) Core(TM) i5-8265U CPU @ 1.60GHz
Memory: 4.95 GB / 15.44 GB
Container: Yes
Shell: 5.2.21 - /bin/bash
Binaries:
Node: 26.2.0 - /home/user/.nvm/versions/node/v26.2.0/bin/node
npm: 12.0.2 - /home/user/.nvm/versions/node/v26.2.0/bin/npm
Browsers:
Firefox: 153.0.3
Firefox Developer Edition: 153.0.3
npmPackages:
vite: ^8.2.0 => 8.2.0
vue: ^3.5.41 => 3.5.41
vue-i18n: ^11.4.8 => 11.4.8
```

### Screenshot

_No response_

### Additional context

_No response_

### Validations

- [x] Read the [Contributing Guidelines](https://github.com/intlify/bundle-tools/blob/main/CONTRIBUTING.md).
- [x] Read the README
- [x] Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
- [x] Check that this is a concrete bug. For Q&A open a [GitHub Discussion](https://github.com/intlify/bundle-tools/discussions).

Start by reproducing the failure with `vite build` using the imports in `i18n.ts` and the VueI18nPlugin settings in `vite.config.ts`. Inspect the `exports` field in `node_modules/@intlify/unplugin-vue-i18n/package.json` and the reported resolver conditions; done means the build completes successfully while development mode and message imports continue to work.

Written by the indexing model from the issue text.