This commit fixes two critical production issues:
1. **Flashcard generator dependencies** - Added all required dependencies to Dockerfile:
- Typst for PDF generation
- Python pip and setuptools
- Python packages (pyyaml, Pillow, imagehash)
- packages/core directory with generate.py script
2. **Deployment info modal** - Fixed git commit hash display on production:
- Modified generate-build-info.js to accept env vars as fallback when .git is unavailable
- Updated Dockerfile to accept GIT_* build arguments
- Updated GitHub Actions workflow to pass git information during Docker build
The deployment info modal (Ctrl+Shift+I) will now show the correct commit hash,
branch, and build time on production, matching the behavior on dev.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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