chore: add pnpm install and build commands to vercel.json

[faizkhairi]

Summary

• Add installCommand and buildCommand to the existing website/vercel.json to configure pnpm as the package manager for Vercel builds, replacing the CRA defaults
• Existing functions, headers, rewrites, redirects, and ignoreCommand are preserved unchanged

Related Issue

Closes #4370

Test Plan

• Verify Vercel preview build uses pnpm for install and build
• Verify existing API proxy, redirects, and cache headers still work
• Confirm no regression in production deployment

[vercel]

@faizkhairi is attempting to deploy a commit to the modsbot's projects Team on Vercel.

A member of the Team first needs to authorize it.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.39%. Comparing base (988c6fd) to head (e9bc8ef).
⚠️ Report is 227 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4375      +/-   ##
==========================================
+ Coverage   54.52%   56.39%   +1.86%     
==========================================
  Files         274      317      +43     
  Lines        6076     6962     +886     
  Branches     1455     1679     +224     
==========================================
+ Hits         3313     3926     +613     
- Misses       2763     3036     +273     

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[jloh02]

@greptile

[greptile-apps]

Confidence Score: 5/5

Safe to merge — the change is a two-line addition to a JSON config file with no effect on application logic.

Both commands are straightforward: --frozen-lockfile correctly locks the install step for production, and pnpm build maps directly to the verified build script in website/package.json. The repo uses a pnpm workspace with pnpm-workspace.yaml at the root, so pnpm will traverse up correctly even when Vercel's working directory is set to website/. No existing config entries are altered.

No files require special attention.

Important Files Changed

Filename	Overview
website/vercel.json	Adds installCommand and buildCommand to wire pnpm as the package manager for Vercel builds; all existing configuration is preserved.

Sequence Diagram

sequenceDiagram
    participant V as Vercel CI
    participant R as Repo Root
    participant W as website/

    V->>R: git clone (full repo)
    V->>W: cd website/ (root dir)
    V->>R: pnpm install --frozen-lockfile
    R-->>V: all workspace deps installed
    V->>W: pnpm build
    W-->>V: "pnpm prepare:optimiser && node scripts/build"
    V->>V: deploy static output + serverless functions

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_{Reviews (1): Last reviewed commit: "Merge branch 'master' into fix/vercel-pn..." | Re-trigger Greptile}