Update to v0.1.18 with per-collector intervals and tmux check

- Implement per-collector interval timing respecting NixOS config
- Remove all hardcoded timeout/interval values and make configurable
- Add tmux session requirement check for TUI mode (bypassed for headless)
- Update agent to send config hash in Build field instead of nixos version
- Add nginx check interval, HTTP timeouts, and ZMQ transmission interval configs
- Update NixOS configuration with new configurable values

Breaking changes:
- Build field now shows nix store config hash (8 chars) instead of nixos version
- All intervals now follow individual collector configuration instead of global

New configuration fields:
- systemd.nginx_check_interval_seconds
- systemd.http_timeout_seconds
- systemd.http_connect_timeout_seconds
- zmq.transmission_interval_seconds

CLAUDE.md

@@ -28,35 +28,34 @@ 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 26, 2025:**
+**Current Status - October 27, 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" ✅
-- Agent version display working: "Agent: v0.1.14" ✅
+- Agent version display working: "Agent: v0.1.17" ✅
 - Cross-host version comparison implemented ✅
 - Automated binary release system working ✅
 - SMART data consolidated into disk collector ✅
 
-**CRITICAL ISSUE - Remote Rebuild Functionality:**
-- ❌ **System Rebuild**: Agent crashes during nixos-rebuild operations
-- ❌ **Systemd Service**: cm-rebuild.service fails with exit status 1
-- ❌ **Output Streaming**: Terminal popup shows agent messages but not rebuild output
-- ⚠️ **Service Control**: Works correctly for start/stop/restart of services
+**RESOLVED - Remote Rebuild Functionality:**
+- ✅ **System Rebuild**: Now uses simple SSH + tmux popup approach
+- ✅ **Process Isolation**: Rebuild runs independently via SSH, survives agent/dashboard restarts
+- ✅ **Configuration**: SSH user and rebuild alias configurable in dashboard config
+- ✅ **Service Control**: Works correctly for start/stop/restart of services
 
-**Problem Details:**
-- Implemented systemd service approach to prevent agent crashes
-- Terminal popup implemented with real-time streaming capability
-- Service produces empty journal lines then exits with status 1
-- Permission issues addressed by moving working directory to /tmp
-- Issue persists despite multiple troubleshooting attempts
-- Manual rebuilds work perfectly when done directly
+**Solution Implemented:**
+- Replaced complex SystemRebuild command infrastructure with direct tmux popup
+- Uses `tmux display-popup "ssh -tt {user}@{hostname} 'bash -ic {alias}'"`
+- Configurable SSH user and rebuild alias in dashboard config
+- Eliminates all agent crashes during rebuilds
+- Simple, reliable, and follows standard tmux interface patterns
 
 **Current Layout:**
 ```
 NixOS:
 Build: 25.05.20251004.3bcc93c
-Agent: 3kvc03nd  # Shows agent version (nix store hash)
+Agent: v0.1.17   # Shows agent version from Cargo.toml
 Active users: cm, simon
 CPU:
 ● Load: 0.02 0.31 0.86 • 3000MHz
@@ -74,6 +73,8 @@ Storage:
 **Overflow handling restored for all widgets ("... and X more") ✅**
 **Agent version display working correctly ✅**
 **Cross-host version comparison logging warnings ✅**
+**Backup panel visibility fixed - only shows when meaningful data exists ✅**
+**SSH-based rebuild system fully implemented and working ✅**
 
 ### Current Keyboard Navigation Implementation