[improve] set game dir on client -> updates Play/Install button based on games existing

crates/lanspread-proto/src/lib.rs

@@ -5,6 +5,7 @@ use tracing::error;
 
 #[derive(Debug, Serialize, Deserialize)]
 pub enum Request {
+    Ping,
     ListGames,
     GetGame { id: String },
     Invalid(Bytes, String),
@@ -12,6 +13,7 @@ pub enum Request {
 
 #[derive(Clone, Debug, Serialize, Deserialize)]
 pub enum Response {
+    Pong,
     Games(Vec<Game>),
     Game(Game),
     GameNotFound(String),