fix(swizzin): Use HTTPS and add curl error handling (#10440)

- Add https:// to s5n.sh URL to ensure secure connection
- Add -f flag to fail on HTTP errors instead of piping error pages to bash
- Add -S flag to show errors even in silent mode

Without -f, if the server returns an error page (4xx/5xx), curl would
pipe that HTML content to bash, causing unexpected behavior.

install/swizzin-install.sh

@@ -23,7 +23,7 @@ if [[ ! "$CONFIRM" =~ ^([yY][eE][sS]|[yY])$ ]]; then
   msg_error "Aborted by user. No changes have been made."
   exit 10
 fi
-bash <(curl -sL s5n.sh)
+bash <(curl -fsSL https://s5n.sh)
 
 motd_ssh
 customize