Clean up unused imports and fix build warnings

- Remove unused imports (Duration, HashMap, SharedError, DateTime, etc.)
- Fix unused variables by prefixing with underscore
- Remove redundant dashboard.toml config file
- Update theme imports to use only needed components
- Maintain all functionality while reducing warnings
- Add srv02 to predefined hosts configuration
- Remove unused broadcast_command methods

dashboard/src/config/mod.rs

@@ -111,6 +111,7 @@ impl Default for HostsConfig {
                 "simonbox".to_string(),
                 "steambox".to_string(),
                 "srv01".to_string(),
+                "srv02".to_string(),
             ],
             default_host: Some("cmbox".to_string()),
         }