[BUG] preview cli doesn't --preview flag to wrangler command

[ShawnXU0208]

Describe the bug

When running opennextjs-cloudflare preview --remote with a preview_id defined in wrangler.toml, OpenNext attempts to populate the KV cache via wrangler kv:bulk put, but it does not pass the required --preview flag to Wrangler. So we get error of this

[ERROR] NEXT_INC_CACHE_KV has both a namespace ID and a preview ID. Specify "--preview" or "--preview false" to avoid writing data to the wrong namespace.

Steps to reproduce

1. Add KV for cache in wrangler config

[[kv_namespaces]]
binding = "NEXT_INC_CACHE_KV"
id = "xxxxxxxxxxxxxx"
preview_id = "xxxxxxxxxx"

(preview_id seems required by wrangler, otherwise you will get error:
In development, you should use a separate kv namespace than the one you'd use in production. Please create a new kv namespace with "wrangler kv namespace create --preview" and add its id as preview_id to the kv_namespace "NEXT_INC_CACHE_KV" in your wrangler.toml file)

2. enable kvIncrementalCach in opennext config

export default defineCloudflareConfig({
  incrementalCache: kvIncrementalCache,
});

3. run opennextjs-cloudflare build && opennextjs-cloudflare preview --remote

error get:
NEXT_INC_CACHE_KV has both a namespace ID and a preview ID. Specify "--preview" or "--preview false" to avoid writing data to the wrong namespace.

Expected behavior

Opennext should set the --preview flag to wrangler put command, or provides a way for us to pass custom wrangler args from cli.
(I can't find how to pass through args in doc, please let me know if I missed it)

@opennextjs/cloudflare version

1.6.1

Wrangler version

4.26

next info output

Using vars defined in .dev.vars

Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 24.5.0: Tue Apr 22 19:54:29 PDT 2025; root:xnu-11417.121.6~2/RELEASE_ARM64_T6030
  Available memory (MB): 18432
  Available CPU cores: 12
Binaries:
  Node: 22.16.0
  npm: 10.9.2
  Yarn: 1.22.22
  pnpm: 10.14.0
Relevant Packages:
  next: 15.3.2 // There is a newer version (15.5.3) available, upgrade recommended! 
  eslint-config-next: 15.3.2
  react: 19.1.0
  react-dom: 19.1.0
  typescript: 5.8.3
Next.js Config:
  output: N/A
 ⚠ There is a newer version (15.5.3) available, upgrade recommended! 
   Please try the latest canary version (`npm install next@canary`) to confirm the issue still exists before creating a new issue.
   Read more - https://nextjs.org/docs/messages/opening-an-issue

Additional context

Cloudflare KV config doc

[james-elicx]

I've put up #888 which should give the correct behaviour.

There is a prerelease available in the PR if you would like to try it out :)

[ShawnXU0208]

Thanks, will try