ci: add web build job to validate frontend on PRs

[dev-jodee]

Summary

• Add a web-build job (new .github/workflows/web.yml) that compiles apps/web on every PR.
• Closes a CI gap: apps/web was never built or typechecked in CI, so a frontend-only change could break the production build with nothing catching it.
• Node-only job (no Rust/Solana toolchain): pnpm install then pnpm --filter @solana/escrow-program-web build. The web app's prebuild hook generates + builds the @solana/escrow TS client from the committed IDL.

Test Plan

Verified the full chain locally, including cold start (client artifacts removed → prebuild regenerates them):

pnpm install
pnpm --filter @solana/escrow-program-web build   # prebuild gen+build client, then tsc -b && vite build -> green

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Project	Deployment	Actions	Updated (UTC)
solana-escrow-program	Ready	Preview, Comment	Jun 4, 2026 1:51pm

[greptile-apps]

Greptile Summary

Adds a new web-build CI job in .github/workflows/web.yml that installs Node dependencies and runs pnpm --filter @solana/escrow-program-web build (including its prebuild hook which regenerates the TypeScript client from the committed IDL). The action versions and job structure are consistent with the existing test.yml and format.yml workflows.

• Closes a CI gap where apps/web was never typechecked or built during CI, meaning a frontend-only breakage could reach main undetected.
• The pull_request trigger correctly scopes to relevant paths (apps/web/**, pnpm-lock.yaml, .nvmrc, and the workflow file itself), matching the pattern used elsewhere in the repo.

Confidence Score: 5/5

Safe to merge — this is a purely additive CI workflow with no production code changes.

The workflow is a straightforward, additive CI job using the same action versions and job structure already proven in this repository. No production code is modified, and the job structure is well-scoped.

No files require special attention.

Important Files Changed

Filename	Overview
.github/workflows/web.yml	New CI job that builds the web app on PRs touching web-related paths and on all pushes to main; action versions match the repo's existing conventions.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Event triggered] --> B{Event type?}
    B -->|push to main| C[Run web-build job]
    B -->|pull_request| D{Paths filter match?}
    D -->|No| E[Skip job]
    D -->|Yes| C
    C --> F[checkout v6]
    F --> G[pnpm action-setup v6]
    G --> H[setup-node v6 with .nvmrc]
    H --> I[pnpm install]
    I --> J[pnpm filter escrow-program-web build]
    J --> K[prebuild: generate TS client from IDL]
    K --> L[tsc and vite build]
    L --> M{Result}
    M -->|success| N[CI passes]
    M -->|failure| O[CI fails]

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_{Reviews (2): Last reviewed commit: "Apply suggestions from code review" | Re-trigger Greptile}