games: the chat line that shows up once, not twice

Your own message came back twice — once from the POST that sent it, once
echoed over your own SSE stream — so the felt printed it on the rail twice.
Drop any chat id already seen; reset the seen-set when the log is cleared
(unseated, and on a full chat reload).

Claude-Session: https://claude.ai/code/session_013M5nD7PgUboJXoDcYHzpuJ

internal/web/static/js/holdem.js

@@ -62,6 +62,7 @@
 
   var chatSection = root.querySelector("[data-chat]");
   var chatLog     = root.querySelector("[data-chat-log]");
+  var chatSeen    = {}; // chat line ids already on the rail, to drop echoed duplicates
   var chatForm    = root.querySelector("[data-chat-form]");
   var chatInput   = root.querySelector("[data-chat-input]");
   var lobbyWrap   = root.querySelector("[data-lobby-wrap]");
@@ -734,6 +735,7 @@
   function unseated() {
     disconnectLive();
     if (chatLog) chatLog.innerHTML = "";
+    chatSeen = {};
   }
 
   function connectLive() {
@@ -775,6 +777,7 @@
       .then(function (data) {
         if (!data || !chatLog) return;
         chatLog.innerHTML = "";
+        chatSeen = {};
         (data.chat || []).forEach(addChat);
       })
       .catch(function () {});
@@ -782,6 +785,12 @@
 
   function addChat(line) {
     if (!chatLog || !line) return;
+    // Your own line comes back twice — once from the POST that sent it, once
+    // echoed over your own stream — so drop any id already on the rail.
+    if (line.id) {
+      if (chatSeen[line.id]) return;
+      chatSeen[line.id] = true;
+    }
     var row = document.createElement("div");
     row.className = "pete-chat-line" + (line.mine ? " pete-chat-mine" : "");
     var who = document.createElement("span");

internal/web/static/js/uno.js

@@ -66,6 +66,7 @@
   var tableMsg   = root.querySelector("[data-table-msg]");
 
   var chatLog   = root.querySelector("[data-chat-log]");
+  var chatSeen  = {}; // chat line ids already on the rail, to drop echoed duplicates
   var chatForm  = root.querySelector("[data-chat-form]");
   var chatInput = root.querySelector("[data-chat-input]");
 
@@ -785,7 +786,7 @@
   // ---- the live stream -------------------------------------------------------
 
   function seated() { loadChat(); connectLive(); }
-  function unseated() { disconnectLive(); if (chatLog) chatLog.innerHTML = ""; }
+  function unseated() { disconnectLive(); if (chatLog) chatLog.innerHTML = ""; chatSeen = {}; }
 
   function connectLive() {
     if (stream || !window.EventSource) return;
@@ -818,6 +819,7 @@
       .then(function (data) {
         if (!data || !chatLog) return;
         chatLog.innerHTML = "";
+        chatSeen = {};
         (data.chat || []).forEach(addChat);
       })
       .catch(function () {});
@@ -825,6 +827,12 @@
 
   function addChat(line) {
     if (!chatLog || !line) return;
+    // Your own line comes back twice — once from the POST that sent it, once
+    // echoed over your own stream — so drop any id already on the rail.
+    if (line.id) {
+      if (chatSeen[line.id]) return;
+      chatSeen[line.id] = true;
+    }
     var row = document.createElement("div");
     row.className = "pete-chat-line" + (line.mine ? " pete-chat-mine" : "");
     var who = document.createElement("span");