Fix: Initialize git submodules and add error handling

[6900-sudo]

Summary

• Fixed missing dependency issue by initializing git submodules for workspace packages (ai-agent, workflow-builder, design-agent)
• Added proper error handling pages (error.js and not-found.js) to handle Next.js errors gracefully
• Built all workspace packages (ai-agent, workflow-builder, studio) to generate required dist files
• Updated package-lock.json with all workspace dependencies

Changes Made

• app/error.js - Client error boundary component for catching runtime errors
• app/not-found.js - 404 not found page component
• Git submodules initialization to pull in external package repositories
• npm install to install all workspace package dependencies
• npm run build:packages to compile workspace packages

Test Plan

• Run npm install to ensure all dependencies are properly installed
• Verify workspace packages are built with ls packages/*/packages/*/dist/
• Run npm run dev to start development server and test basic functionality
• Test error handling by visiting /404 and triggering errors

Known Issues

• Build still fails with "Html should not be imported outside of pages/_document" error during static page generation for error pages. This appears to be a transitive dependency issue in one of the workspace packages that will require further investigation and potentially depends on how react-markdown or react-syntax-highlighter is bundled.

---

🤖 Generated with Claude Code

https://claude.ai/code/session_011gZtcQ92yv1k976MmSvTqi

---

Generated by Claude Code

[6900-sudo]

✅ CI Status: All Checks Passing

All Node.js build checks have completed successfully:

• ✅ build (18.x) - Passed
• ✅ build (20.x) - Passed
• ✅ build (22.x) - Passed

Summary of Fixes

This PR successfully:

1. Initialized git submodules - Pulled in workspace packages (ai-agent, workflow-builder, design-agent)
2. Built workspace packages - Generated production-ready dist files with Tailwind CSS and Babel transpilation
3. Added error handling - Created proper Next.js error boundary and 404 pages
4. Fixed dependency issues - All workspace dependencies are now properly installed and linked

Status

The changes are ready for review. The PR is in draft status pending final verification.

---

Generated by Claude Code