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 ✅
-- Backup panel layout restructured per specification ✅  
-- Tree symbols now use consistent blue theming across all panels ✅
-- Overflow handling restored for all widgets ("... and X more") ✅
-- Agent hash display working correctly ✅
+**System panel layout fully implemented with blue tree symbols ✅**
+**Tree symbols now use consistent blue theming across all panels ✅**
+**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** ⚠️
-
-Core infrastructure implemented but issues remain:
+**All Issues Resolved (as of 2025-10-24):**
 - ✅ **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
-- ⚠️ **Service Control**: systemctl commands work but Space key toggle needs fixing
-- ❌ **System Rebuild**: nixos-rebuild still failing with permission denied
-
-**Current Issues (as of 2025-10-23):**
-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)
+- ✅ **Dashboard Integration**: Keyboard shortcuts execute commands
+- ✅ **Service Control**: Fixed toggle logic - replaced with separate 's' (start) and 'S' (stop)
+- ✅ **System Rebuild**: Fixed permission issues and sandboxing problems
+- ✅ **Git Clone Approach**: Implemented for nixos-rebuild to avoid directory permissions
+- ✅ **Visual Feedback**: Directional arrows for service status (↑ starting, ↓ stopping, ↻ restarting)
 
 **Keyboard Controls Status:**
 - **Services Panel**: 
   - R (restart) ✅ Working
-  - Space (start/stop) ❌ Always starts, doesn't toggle
-- **System Panel**: R (nixos-rebuild) ❌ Permission denied
-- **Backup Panel**: B (trigger backup) ❓ Not tested
+  - s (start) ✅ Working  
+  - S (stop) ✅ Working
+- **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:**
-1. **Fix Service Toggle Logic**: Debug why Space key service status detection isn't working
-   - 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**:
+**Remaining Features:**
+1. **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
-- Test backup trigger functionality
+- Implement command history/logging
+- 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