fix: sshCmd closure bug + error display

CRITICAL BUG: sshConnectCmd wrapped tea.ExecProcess inside an extra
closure, so Bubble Tea never executed the SSH process — Enter appeared
to do nothing.

Fix:
- sshConnectCmd now returns tea.ExecProcess directly (no extra closure)
- tea.ExecProcess handles all process lifecycle (start, PTY, exit)
- sshExitMsg errors are shown in host list view (ErrorStyle)
- Error routed via Model.Error → HostListTab.err → View()

pkg/tui/host_list_tab.go

@@ -121,6 +121,13 @@ func (t *HostListTab) View() string {
 
 	var b strings.Builder
 
+	// Show error if any
+	if t.err != nil {
+		b.WriteString(ErrorStyle.Render(fmt.Sprintf(" Error: %v ", t.err)))
+		b.WriteString("\n")
+		t.err = nil
+	}
+
 	// Capped vertical padding
 	b.WriteString(strings.Repeat("\n", 2))