Add interactive SSH terminal session functionality

- Press 't' to open SSH session to current host in tmux split
- Uses 30% vertical split consistent with logs and rebuild commands
- Auto-closes tmux window when SSH session ends
- Provides direct host administration access from dashboard
- Uses same SSH configuration as rebuild operations

Version 0.1.65

dashboard/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cm-dashboard"
-version = "0.1.64"
+version = "0.1.65"
 edition = "2021"
 
 [dependencies]

dashboard/src/ui/mod.rs

@@ -365,6 +365,25 @@ impl TuiApp {
                         }
                     }
                 }
+                KeyCode::Char('t') => {
+                    // Open SSH terminal session in tmux window
+                    if let Some(hostname) = self.current_host.clone() {
+                        let ssh_command = format!(
+                            "ssh -tt {}@{}",
+                            self.config.ssh.rebuild_user,
+                            hostname
+                        );
+                        
+                        std::process::Command::new("tmux")
+                            .arg("split-window")
+                            .arg("-v")
+                            .arg("-p")
+                            .arg("30") // Use 30% like other commands
+                            .arg(&ssh_command)
+                            .spawn()
+                            .ok(); // Ignore errors, tmux will handle them
+                    }
+                }
                 KeyCode::Tab => {
                     // Tab cycles to next host
                     self.navigate_host(1);