Add generated .pi-map.md and .pi-map.index.md files across the repository
so the project navigation maps are shared and versioned. These artifacts
are maintained by project_map_init/patch/validate and must be kept in
sync with source edits.
Note: .cache/ remains ignored (added in previous commit).
- Restored original desktop CSS that was accidentally overwritten
- Added back all mobile-specific styles
- CSS file now 3945 lines (original + mobile styles)
- Build passes successfully