Fix filesystem children creation logic

- Allow filesystem entries to be created with any metric, not just mount_point
- Ensure filesystem children appear under physical drive pools
- Improve mount point fallback logic for better compatibility

dashboard/src/ui/widgets/system.rs

@@ -256,16 +256,20 @@ impl SystemWidget {
                             });
 
                             if !fs_exists {
-                                // Only create filesystem entry if we have the mount_point metric
-                                // This ensures we get the correct mount point path
-                                if metric_type != "mount_point" {
-                                    continue; // Skip non-mount_point metrics if filesystem doesn't exist yet
-                                }
-                                
-                                let mount_point = if let MetricValue::String(mount) = &metric.value {
-                                    mount.clone()
+                                // Create filesystem entry with correct mount point
+                                let mount_point = if metric_type == "mount_point" {
+                                    if let MetricValue::String(mount) = &metric.value {
+                                        mount.clone()
+                                    } else {
+                                        // Fallback: handle special cases
+                                        if fs_name == "root" {
+                                            "/".to_string()
+                                        } else {
+                                            format!("/{}", fs_name.replace('_', "/"))
+                                        }
+                                    }
                                 } else {
-                                    // Fallback: handle special cases
+                                    // Fallback for non-mount_point metrics: generate mount point from fs_name
                                     if fs_name == "root" {
                                         "/".to_string()
                                     } else {