Implement rebuild progress indicator with host persistence

- Add blue circular arrow (↻) status icon during SystemRebuild commands
- Keep rebuilding hosts visible in dashboard even when temporarily offline
- Extend connection timeout to 5 minutes for hosts undergoing rebuild
- Prevent host switching during rebuild operations
- Update status bar to show rebuild progress immediately when R key pressed

CLAUDE.md

@@ -28,16 +28,18 @@ All keyboard navigation and service selection features successfully implemented:
 - ✅ **Smart Panel Switching**: Only cycles through panels with data (backup panel conditional)
 - ✅ **Scroll Support**: All panels support content scrolling with proper overflow indicators
 
-**Current Status - October 23, 2025:**
+**Current Status - October 24, 2025:**
 - All keyboard navigation features working correctly ✅
 - Service selection cursor implemented with focus-aware highlighting ✅
 - Panel scrolling fixed for System, Services, and Backup panels ✅
 - Build display working: "Build: 25.05.20251004.3bcc93c" ✅
+- Configuration hash display implemented: "Config: d16f0d0" ✅
 
 **Layout Achieved:**
 ```
 NixOS:
-Build: 25.05.20251004.3bcc93c  # Target (currently shows "unknown")
+Build: 25.05.20251004.3bcc93c
+Config: d16f0d0  # Shows actual nixosbox config hash
 Active users: cm, simon
 CPU:
 ● Load: 0.02 0.31 0.86 • 3000MHz
@@ -50,12 +52,10 @@ Storage:
  └─ ● 18% 167.4GB/928.2GB
 ```
 
-**Current Status - October 23, 2025:**
+**System panel layout fully implemented with blue tree symbols ✅**
-- System panel layout fully implemented with blue tree symbols ✅
+**Tree symbols now use consistent blue theming across all panels ✅**
-- Backup panel layout restructured per specification ✅  
+**Overflow handling restored for all widgets ("... and X more") ✅**
-- Tree symbols now use consistent blue theming across all panels ✅
+**Agent hash display working correctly ✅**
-- Overflow handling restored for all widgets ("... and X more") ✅
-- Agent hash display working correctly ✅
 
 ### Current Keyboard Navigation Implementation
 
@@ -77,28 +77,24 @@ Storage:
 - **Focus-Aware Selection**: Selection highlighting only visible when Services panel focused
 - **Dynamic Statusbar**: Context-aware shortcuts based on focused panel
 
-### Current Priority: Visual Feedback Implementation
+### Remote Command Execution - WORKING ✅
 
-**Remote Command Execution - PARTIALLY WORKING** ⚠️
+**All Issues Resolved (as of 2025-10-24):**
-
-Core infrastructure implemented but issues remain:
 - ✅ **ZMQ Command Protocol**: Extended with ServiceControl and SystemRebuild variants
 - ✅ **Agent Handlers**: systemctl and nixos-rebuild execution with maintenance mode
-- ✅ **Dashboard Integration**: Existing keyboard shortcuts now execute commands
+- ✅ **Dashboard Integration**: Keyboard shortcuts execute commands
-- ⚠️ **Service Control**: systemctl commands work but Space key toggle needs fixing
+- ✅ **Service Control**: Fixed toggle logic - replaced with separate 's' (start) and 'S' (stop)
-- ❌ **System Rebuild**: nixos-rebuild still failing with permission denied
+- ✅ **System Rebuild**: Fixed permission issues and sandboxing problems
-
+- ✅ **Git Clone Approach**: Implemented for nixos-rebuild to avoid directory permissions
-**Current Issues (as of 2025-10-23):**
+- ✅ **Visual Feedback**: Directional arrows for service status (↑ starting, ↓ stopping, ↻ restarting)
-1. **Service Toggle Bug**: Space key always sends "Start" instead of toggling start/stop
-2. **nixos-rebuild Permissions**: Still getting permission denied despite sudo config updates
-3. **No Command Completion**: Visual feedback shows ⏳ but never completes (missing response protocol)
 
 **Keyboard Controls Status:**
 - **Services Panel**: 
   - R (restart) ✅ Working
-  - Space (start/stop) ❌ Always starts, doesn't toggle
+  - s (start) ✅ Working  
-- **System Panel**: R (nixos-rebuild) ❌ Permission denied
+  - S (stop) ✅ Working
-- **Backup Panel**: B (trigger backup) ❓ Not tested
+- **System Panel**: R (nixos-rebuild) ✅ Working with --option sandbox false
+- **Backup Panel**: B (trigger backup) ❓ Not implemented
 
 **Visual Feedback Implementation - IN PROGRESS:**
 
@@ -126,26 +122,21 @@ Latest backup:              →    Latest backup:
 
 **Next Session Priority Tasks:**
 
-**Critical Fixes Needed:**
+**Remaining Features:**
-1. **Fix Service Toggle Logic**: Debug why Space key service status detection isn't working
+1. **Command Response Protocol**:
-   - Check systemd metric format (`systemd_{service}_status`)
-   - Test service status parsing logic  
-   - Ensure toggle detects active vs inactive correctly
-
-2. **Resolve nixos-rebuild Permissions**: 
-   - Verify sudo rules are actually applied after NixOS rebuild
-   - Test `sudo -u cm-agent sudo nixos-rebuild --help` manually
-   - May need different approach for nixos-rebuild access
-
-3. **Implement Command Response Protocol**:
    - Agent sends command completion/failure back to dashboard via ZMQ
    - Dashboard updates UI status from ⏳ to ● when commands complete
    - Clear success/failure status after timeout
 
-**Secondary Tasks:**
+2. **Backup Panel Features**:
+   - Implement backup trigger functionality (B key)
+   - Complete visual feedback for backup operations
+   - Add backup progress indicators
+
+**Enhancement Tasks:**
 - Add confirmation dialogs for destructive actions (stop/restart/rebuild)
-- Complete visual feedback for System and Backup panels
+- Implement command history/logging
-- Test backup trigger functionality
+- Add keyboard shortcuts help overlay
 
 **Future Enhanced Navigation:**
 - Add Page Up/Down for faster scrolling through long service lists
@@ -155,7 +146,7 @@ Latest backup:              →    Latest backup:
 **Future Advanced Features:**
 - Service dependency visualization
 - Historical service status tracking
-- Backup trigger functionality with progress indication
+- Real-time log viewing integration
 
 ## Core Architecture Principles - CRITICAL
 

dashboard/src/app.rs

@@ -238,9 +238,25 @@ impl Dashboard {
 
                     // Update TUI with new hosts and metrics (only if not headless)
                     if let Some(ref mut tui_app) = self.tui_app {
-                        let connected_hosts = self
+                        let mut connected_hosts = self
                             .metric_store
                             .get_connected_hosts(Duration::from_secs(30));
+                        
+                        // Add hosts that are rebuilding but may be temporarily disconnected
+                        // Use extended timeout (5 minutes) for rebuilding hosts
+                        let rebuilding_hosts = self
+                            .metric_store
+                            .get_connected_hosts(Duration::from_secs(300));
+                        
+                        for host in rebuilding_hosts {
+                            if !connected_hosts.contains(&host) {
+                                // Check if this host is rebuilding in the UI
+                                if tui_app.is_host_rebuilding(&host) {
+                                    connected_hosts.push(host);
+                                }
+                            }
+                        }
+                        
                         tui_app.update_hosts(connected_hosts);
                         tui_app.update_metrics(&self.metric_store);
                     }

dashboard/src/ui/mod.rs

@@ -226,6 +226,16 @@ impl TuiApp {
     pub fn update_hosts(&mut self, hosts: Vec<String>) {
         // Sort hosts alphabetically
         let mut sorted_hosts = hosts.clone();
+        
+        // Keep hosts that are undergoing SystemRebuild even if they're offline
+        for (hostname, host_widgets) in &self.host_widgets {
+            if let Some(CommandStatus::InProgress { command_type: CommandType::SystemRebuild, .. }) = &host_widgets.command_status {
+                if !sorted_hosts.contains(hostname) {
+                    sorted_hosts.push(hostname.clone());
+                }
+            }
+        }
+        
         sorted_hosts.sort();
         self.available_hosts = sorted_hosts;
         
@@ -375,6 +385,18 @@ impl TuiApp {
         info!("Switched to host: {}", self.current_host.as_ref().unwrap());
     }
 
+    /// Check if a host is currently rebuilding
+    pub fn is_host_rebuilding(&self, hostname: &str) -> bool {
+        if let Some(host_widgets) = self.host_widgets.get(hostname) {
+            matches!(
+                &host_widgets.command_status,
+                Some(CommandStatus::InProgress { command_type: CommandType::SystemRebuild, .. })
+            )
+        } else {
+            false
+        }
+    }
+
     /// Switch to next panel (Shift+Tab) - only cycles through visible panels
     pub fn next_panel(&mut self) {
         let visible_panels = self.get_visible_panels();
@@ -660,10 +682,21 @@ impl TuiApp {
                 spans.push(Span::styled(" ", Typography::title()));
             }
 
-            // Calculate overall host status from metrics
+            // Check if this host has a SystemRebuild command in progress
-            let host_status = self.calculate_host_status(host, metric_store);
+            let (status_icon, status_color) = if let Some(host_widgets) = self.host_widgets.get(host) {
-            let status_icon = StatusIcons::get_icon(host_status);
+                if let Some(CommandStatus::InProgress { command_type: CommandType::SystemRebuild, .. }) = &host_widgets.command_status {
-            let status_color = Theme::status_color(host_status);
+                    // Show blue circular arrow during rebuild
+                    ("↻", Theme::highlight())
+                } else {
+                    // Normal status icon based on metrics
+                    let host_status = self.calculate_host_status(host, metric_store);
+                    (StatusIcons::get_icon(host_status), Theme::status_color(host_status))
+                }
+            } else {
+                // No host widgets yet, use normal status
+                let host_status = self.calculate_host_status(host, metric_store);
+                (StatusIcons::get_icon(host_status), Theme::status_color(host_status))
+            };
 
             // Add status icon
             spans.push(Span::styled(