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]