Moved CSS imports from Tailwind config to JavaScript to let ESBuild handle them.
This fixes the Docker build error where Tailwind couldn't resolve node_modules paths.
- Removed CSS @import statements from app.css
- Added CSS imports to map.ts where Leaflet is used
- Configured ESBuild to handle CSS and image files
- Added missing topbar package to package.json
- Updated both dev and prod ESBuild configs
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
