Build and Fix

Incrementally fix TypeScript and build errors:

1. Run build: npm run build or pnpm build

2. Parse error output:

   • Group by file
   • Sort by severity

3. For each error:

   • Show error context (5 lines before/after)
   • Explain the issue
   • Propose fix
   • Apply fix
   • Re-run build
   • Verify error resolved