chore(nextjs): upgrade to 16.4.0

[waleedlatif1]

Summary

• Upgrade Next.js, its environment loader, and all platform SWC packages from 16.3.6 to 16.4.0 across the app, docs, and shared packages. Reviewed the 16.4 release notes and bundled migration guidance.
• Allow the pinned framework packages through the package-age gate so frozen CI installs work with the new release.
• Move docs Open Graph rendering to the default Node.js runtime and load OpenAPI specs through static imports to bound filesystem tracing.

Type of Change

• Maintenance

Testing

• Frozen install with the committed package-age policy; cleanup; root lint; all 26 workspace type checks; all 58 audits; block-registry and docs-manifest checks.
• Full root test suite, including 35,191 passing app tests; focused docs suite (8 tests).
• Production builds for the app and docs (1,602 generated docs pages).
• Real production HTTP checks: 6 app checks cover health, login, anonymous sessions, redirects, and protected API denial; 8 docs checks cover HTML, Markdown, search, OpenAPI JSON, redirects, and the 1200×675 Open Graph PNG. Local JSON reports retain status and duration for every request.
• Lint reports one warning in an unchanged test. The app build reports CSS optimizer warnings for unchanged ::highlight rules.

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing (no test additions; existing suites pass)
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

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Project	Deployment	Actions	Updated
docs	Ready	Preview	Oct 7, 2026 6:26am UTC

[waleedlatif1]

@greptile

[waleedlatif1]

@cubic-dev-ai review this PR

[cubic-dev-ai]

@cubic-dev-ai review this PR

@waleedlatif1 I have started the AI code review. It will take a few minutes to complete.

[cubic-dev-ai]

No issues found across 10 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Turn on auto-fix | Re-trigger cubic}

[greptile-apps]

Confidence Score: 5/5

[High risk] Upgrades Next.js framework across multiple apps and packages.

The PR appears safe to merge; no actionable failure was established.

What we checked:

• All docs specs remain available: Every entry in OPENAPI_SPEC_FILES has a matching import in SPEC_BY_FILE. SPECS follows the original file order.

Summary

Upgrades next, @next/env, and the platform compiler packages from 16.3.6 to 16.4.0 across the workspaces and lockfile.

• Exempts next and @next/env from the package-age gate.
• Moves docs Open Graph rendering to the default Node.js runtime.
• Replaces lazy filesystem reads with static OpenAPI imports.
• No actionable issues were established.

_{Reviews (1) · Last reviewed commit: "chore(nextjs): upgrade to 16.4.0" · Reviewed by Greptile}