Improve NVMe serial parsing and restructure MergerFS display

- Fix NVMe serial number parsing to handle whitespace variations
- Move mount point to MergerFS header, remove drive count
- Restructure data drives to same level as parity with Data_1, Data_2 labels
- Remove "Total:" label from pool usage line
- Update parity to use closing tree symbol as last item

dashboard/src/ui/widgets/system.rs

@@ -391,8 +391,8 @@ impl SystemWidget {
                     pool.name.clone()
                 }
             } else {
-                // For mergerfs pools, show pool name with format like "mergerfs (2+1):"
-                format!("{}:", pool.pool_type)
+                // For mergerfs pools, show pool type with mount point
+                format!("mergerfs {}:", pool.mount_point)
             };
 
             let pool_spans = StatusIcons::create_status_spans(pool.status.clone(), &pool_label);
@@ -431,7 +431,7 @@ impl SystemWidget {
                 //   └─ Mount: /srv/media
                 
                 // Pool total usage
-                let total_text = format!("Total: {:.0}% {:.1}GB/{:.1}GB",
+                let total_text = format!("{:.0}% {:.1}GB/{:.1}GB",
                     pool.usage_percent.unwrap_or(0.0),
                     pool.used_gb.unwrap_or(0.0),
                     pool.total_gb.unwrap_or(0.0)
@@ -442,20 +442,30 @@ impl SystemWidget {
                 total_spans.extend(StatusIcons::create_status_spans(Status::Ok, &total_text));
                 lines.push(Line::from(total_spans));
 
-                // Data Disks section
-                if !pool.data_drives.is_empty() {
-                    lines.push(Line::from(vec![
-                        Span::styled("  ├─ ", Typography::tree()),
-                        Span::styled("Data Disks:", Typography::secondary())
-                    ]));
-                    for (i, drive) in pool.data_drives.iter().enumerate() {
-                        let is_last = i == pool.data_drives.len() - 1;
-                        let tree_symbol = if is_last { "  │  └─ " } else { "  │  ├─ " };
-                        render_mergerfs_drive(drive, tree_symbol, &mut lines);
+                // Data drives - at same level as parity
+                for (i, drive) in pool.data_drives.iter().enumerate() {
+                    let mut drive_details = Vec::new();
+                    if let Some(temp) = drive.temperature {
+                        drive_details.push(format!("T: {}°C", temp as i32));
                     }
+                    if let Some(wear) = drive.wear_percent {
+                        drive_details.push(format!("W: {}%", wear as i32));
+                    }
+
+                    let drive_text = if !drive_details.is_empty() {
+                        format!("Data_{}: {} {}", i + 1, drive.name, drive_details.join(" "))
+                    } else {
+                        format!("Data_{}: {}", i + 1, drive.name)
+                    };
+
+                    let mut data_spans = vec![
+                        Span::styled("  ├─ ", Typography::tree()),
+                    ];
+                    data_spans.extend(StatusIcons::create_status_spans(drive.status.clone(), &drive_text));
+                    lines.push(Line::from(data_spans));
                 }
 
-                // Parity section
+                // Parity drives - last item
                 if !pool.parity_drives.is_empty() {
                     for drive in &pool.parity_drives {
                         let mut drive_details = Vec::new();
@@ -465,7 +475,7 @@ impl SystemWidget {
                         if let Some(wear) = drive.wear_percent {
                             drive_details.push(format!("W: {}%", wear as i32));
                         }
-                        
+
                         let drive_text = if !drive_details.is_empty() {
                             format!("Parity: {} {}", drive.name, drive_details.join(" "))
                         } else {
@@ -473,19 +483,12 @@ impl SystemWidget {
                         };
 
                         let mut parity_spans = vec![
-                            Span::styled("  ├─ ", Typography::tree()),
+                            Span::styled("  └─ ", Typography::tree()),
                         ];
                         parity_spans.extend(StatusIcons::create_status_spans(drive.status.clone(), &drive_text));
                         lines.push(Line::from(parity_spans));
                     }
                 }
-
-                // Mount point
-                lines.push(Line::from(vec![
-                    Span::styled("  └─ ", Typography::tree()),
-                    Span::styled("Mount: ", Typography::secondary()),
-                    Span::styled(&pool.mount_point, Typography::secondary())
-                ]));
             }
         }