fixed, session selector at start and fixed load chat

diagnostic/index.html

@@ -570,8 +570,8 @@
         }
         // Chat-History (nach F5 / Reconnect)
         if (msg.type === 'chat_history') {
+          chatBox.innerHTML = '';
           if (msg.messages && msg.messages.length > 0) {
-            chatBox.innerHTML = '';
             for (const m of msg.messages) {
               const el = document.createElement('div');
               el.className = `chat-msg ${m.type}`;

diagnostic/server.js

@@ -35,7 +35,7 @@ const state = {
   rvs: { status: "disconnected", lastError: null },
   proxy: { status: "unknown", lastError: null },
 };
-const SESSION_KEY_FILE = "/tmp/aria-active-session";
+const SESSION_KEY_FILE = "/data/active-session";
 let activeSessionKey = (() => {
   try { return fs.readFileSync(SESSION_KEY_FILE, "utf-8").trim(); } catch { return "main"; }
 })();