Add service logs feature and improve tmux popup sizing

New Features:
- Add journalctl service logs viewer via Shift+J key
- Opens tmux popup with real-time log streaming using journalctl -f
- Shows last 50 lines and follows new log entries for selected service
- Popup titled 'Logs: service.service' for clear context

Improvements:
- Increase tmux popup size to 80% width and height for better readability
- Applies to both rebuild (R) and logs (J) popups
- Compact status line text to fit new J: Logs shortcut
- Updated documentation with new key binding

Navigation Updates:
- J: Show service logs (journalctl in tmux popup)
- Status line: Tab: Host • ↑↓/jk: Select • r: Rebuild • s/S: Start/Stop • J: Logs • q: Quit

Bump version to v0.1.46

dashboard/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cm-dashboard"
-version = "0.1.45"
+version = "0.1.46"
 edition = "2021"
 
 [dependencies]

dashboard/src/ui/mod.rs

@@ -260,6 +260,10 @@ ssh -tt {}@{} 'bash -ic {}'",
                         
                         std::process::Command::new("tmux")
                             .arg("display-popup")
+                            .arg("-w")
+                            .arg("80%")
+                            .arg("-h") 
+                            .arg("80%")
                             .arg(&logo_and_rebuild)
                             .spawn()
                             .ok(); // Ignore errors, tmux will handle them
@@ -281,6 +285,29 @@ ssh -tt {}@{} 'bash -ic {}'",
                         }
                     }
                 }
+                KeyCode::Char('J') => {
+                    // Show service logs via journalctl in tmux popup
+                    if let (Some(service_name), Some(hostname)) = (self.get_selected_service(), self.current_host.clone()) {
+                        let journalctl_command = format!(
+                            "ssh -tt {}@{} 'journalctl -u {}.service -f --no-pager -n 50'",
+                            self.config.ssh.rebuild_user,
+                            hostname,
+                            service_name
+                        );
+                        
+                        std::process::Command::new("tmux")
+                            .arg("display-popup")
+                            .arg("-w")
+                            .arg("80%")
+                            .arg("-h") 
+                            .arg("80%")
+                            .arg("-t")
+                            .arg(format!("Logs: {}.service", service_name))
+                            .arg(&journalctl_command)
+                            .spawn()
+                            .ok(); // Ignore errors, tmux will handle them
+                    }
+                }
                 KeyCode::Char('b') => {
                     // Trigger backup
                     if let Some(hostname) = self.current_host.clone() {
@@ -686,10 +713,11 @@ ssh -tt {}@{} 'bash -ic {}'",
         let mut shortcuts = Vec::new();
         
         // Global shortcuts
-        shortcuts.push("Tab: Switch Host".to_string());
-        shortcuts.push("↑↓/jk: Select Service".to_string());
-        shortcuts.push("r: Rebuild Host".to_string());
-        shortcuts.push("s/S: Start/Stop Service".to_string());
+        shortcuts.push("Tab: Host".to_string());
+        shortcuts.push("↑↓/jk: Select".to_string());
+        shortcuts.push("r: Rebuild".to_string());
+        shortcuts.push("s/S: Start/Stop".to_string());
+        shortcuts.push("J: Logs".to_string());
         
         // Always show quit
         shortcuts.push("q: Quit".to_string());