Fix local dev R2 binding so published images preview correctly

[ianmuchyri]

Summary

Follow-up to the equivalent fix in magistrala-docs: absmach/magistrala-docs#171

Previously, once an image was published to the shared websites-images R2 bucket via scripts/publish-image.mjs, there was no way to actually preview it locally:

• pnpm run dev (plain next dev) has zero knowledge of wrangler.jsonc / the Worker, so it always 404s on doc images (expected, not fixed here).
• wrangler dev runs the real Worker, but its R2 binding defaulted to an empty local simulated bucket, not the real one, so published images still 404'd.
• Worse, the wrangler version pinned in package.json (^4.81.1) falls in a range with a real bug: a remote R2 binding throws SyntaxError: Unexpected end of JSON input instead of proxying to R2 at all. Confirmed fixed at wrangler 4.120.0.

Three changes:

1. wrangler.jsonc: add "remote": true to the IMAGES_BUCKET R2 binding, so wrangler dev proxies to the real bucket instead of an empty local simulator. Confirmed via wrangler's own config-schema.json that this field is local-dev-only and has no effect on the deployed Worker.
2. package.json: bump wrangler devDependency from ^4.81.1 to ^4.120.0, with pnpm-lock.yaml updated accordingly (pnpm install also added two minimumReleaseAgeExclude entries to pnpm-workspace.yaml for wrangler@4.120.0 and miniflare@5.20260801.1-alpha, a pnpm supply-chain-age guard needed to resolve those versions).
3. scripts/README.md: new "Previewing images locally" section (placed after "Publishing an image", before "Bulk-uploading via the R2 dashboard") documenting the pnpm run build && npx wrangler dev workflow, the "remote": true binding, and the wrangler version requirement.

Test plan

• pnpm install — lockfile updated, ./node_modules/.bin/wrangler --version reports 4.120.0
• pnpm run types:check — passes (this repo's script also runs wrangler types)
• pnpm run build — succeeds, produces ./out
• npx wrangler dev — startup banner shows env.IMAGES_BUCKET (websites-images) R2 Bucket remote (mode = remote, not local); no SyntaxError crash
• Homepage returns 200 (/ redirects 301 to /docs/cocos-ai/, which returns 200 — that's this site's existing basePath redirect, unrelated to this change)
• Hit a real doc image path (/docs/cocos-ai/img/agent/overview.png) through the running wrangler dev — after the "Establishing remote connection" phase settled, it returned the actual PNG bytes from the real bucket

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	cocos-docs	857a6ee	Commit Preview URL Branch Preview URL	Aug 07 2026, 04:53 PM