The /client launcher read a non-existent `nitro_client_url` setting, so it
always fell through to "No client configured" and the client never launched.
Faithful to AtomCMS's NitroController + nitro.blade.php, build the launch URL
as {nitro_path}/index.html?sso=<ticket> plus the toolbar colour params, via a
shared buildNitroClientUrl helper. The Flash launcher's Nitro fallback used the
same dead key and is fixed too.
Simo
56cd6fd058