web: accept the serialized reels array and stop game loops on navigation

The Rust SlotsView serializes reels as an array of chars, so the browser joins it instead of String(array). The crash chart, reel animation and roulette observer now stop when another screen takes over, and a returning crash screen rebuilds its detached canvas. Action buttons ignore a double click before the server view arrives.

Also tightens the gateway session registry with a generation token, caps WebSocket messages at 64 KiB, uses the __Host- cookie prefix on HTTPS, and ships the systemd unit.

2 files changed, 26 insertions, 1 deletions

diff --git a/webd/src/session.rs b/webd/src/session.rs
index 8a20721..3b34f47 100644
--- a/webd/src/session.rs
+++ b/webd/src/session.rs
@@ -575,7 +575,12 @@ mod tests {
         let id = "a".repeat(64);
         assert_eq!(
             cookie_id(&format!("other=1; {COOKIE_NAME}={id}; theme=dark")),
-            Some(id)
+            Some(id.clone())
+        );
+        assert_eq!(
+            cookie_id(&format!("{HOST_COOKIE_NAME}={id}")),
+            Some(id),
+            "the secure __Host- name is accepted"
         );
         assert_eq!(cookie_id(&format!("{COOKIE_NAME}=short")), None);
         assert_eq!(cookie_id("other=1"), None);
diff --git a/webd/zagan-bet-webd.service b/webd/zagan-bet-webd.service
new file mode 100644
index 0000000..58bec71
--- /dev/null
+++ b/webd/zagan-bet-webd.service
@@ -0,0 +1,20 @@
+[Unit]
+Description=zagan-bet browser gateway
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+User=zagan
+Group=zagan
+EnvironmentFile=/etc/zagan-bet-webd.env
+ExecStart=/usr/local/bin/zagan-bet-webd
+Restart=on-failure
+RestartSec=2
+NoNewPrivileges=true
+PrivateTmp=true
+ProtectSystem=strict
+ProtectHome=true
+
+[Install]
+WantedBy=multi-user.target