Fix Corrupted Panda CSS (styled-system)

This project uses Panda CSS which generates a styled-system/ directory. This directory can become corrupted when:

• Prettier or other formatters modify the generated files
• Git merge conflicts in styled-system/
• Interrupted panda codegen runs
• Node modules corruption

Symptoms

• Styles not applying correctly
• CSS appears broken or missing
• Build errors mentioning styled-system
• Type errors in styled-system/ imports
• Visual regressions that appeared without code changes

Fix Procedure

Run these commands in order:

# 1. Delete the corrupted styled-system
rm -rf apps/web/styled-system

# 2. Regenerate it with Panda CSS
cd apps/web && pnpm panda codegen

# 3. Clear Next.js cache (if build errors persist)
rm -rf apps/web/.next

# 4. Rebuild to verify
cd /Users/antialias/projects/soroban-abacus-flashcards && pnpm build

Verification

After regeneration, verify:

1. apps/web/styled-system/ directory exists with fresh files
2. pnpm build completes without styled-system errors
3. Dev server shows correct styling

Prevention

The repo has .prettierignore at the root that excludes **/styled-system/**. If corruption keeps happening:

1. Verify .prettierignore contains **/styled-system/**
2. Check that IDE formatters respect .prettierignore
3. Ensure git hooks don't format styled-system files

Quick One-Liner

For fast fix without explanation:

rm -rf apps/web/styled-system apps/web/.next && cd apps/web && pnpm panda codegen && cd ../.. && pnpm build