Add printer lookup page and fiscal week theme styling

- Add printerlookup.asp for Zabbix integration (lookup by IP/FQDN)
- Add fiscal week sidebar styling for all 16 themes
- Update CLAUDE.md with External Integrations section
- Fix fiscal week box centering with inline styles

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CLAUDE.md

@@ -142,6 +142,12 @@ PCs are in the machines table, identified by:
 | getDashboardData | GET | Health check |
 | updatePrinterMapping | POST | Printer assignments |
 
+## External Integrations
+
+| Page | Purpose |
+|------|---------|
+| `printerlookup.asp?ip=x.x.x.x` | Zabbix printer lookup by IP/FQDN |
+
 ## Quick Reference
 
 ### Start Dev Environment