Auto-fix tmux extended-keys compatibility on attach/create

- Automatically set extended-keys off after entering tmux session
- Ensures key combos work on all tmux versions 2.0+ (including 3.3/3.4)
- Remove version warning banner (no longer needed)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: davindicode

app/components/terminal/InputBox.tsx

@@ -165,7 +165,6 @@ export default function InputBox() {
   const [text, setText] = useState("");
   const [activeGroup, setActiveGroup] = useState<string | null>(null);
   const [tmuxSessions, setTmuxSessions] = useState<TmuxSession[]>([]);
-  const [tmuxVersion, setTmuxVersion] = useState<string | null>(null);
   const [tmuxLoading, setTmuxLoading] = useState(false);
   const [tmuxNewName, setTmuxNewName] = useState("");
   const [editorFileName, setEditorFileName] = useState("");
@@ -276,16 +275,31 @@ export default function InputBox() {
       const res = await fetch("/api/tmux/sessions");
       const data = await res.json();
       setTmuxSessions(data.sessions || []);
-      if (data.version) setTmuxVersion(data.version);
     } catch { setTmuxSessions([]); }
     setTmuxLoading(false);
   };
 
+  // After entering tmux, disable extended-keys for compatibility with 3.3/3.4
+  const ensureTmuxCompat = () => {
+    if (!activeSessionId) return;
+    setTimeout(() => {
+      // Send Ctrl+B : to open tmux command prompt, then set extended-keys off
+      sendInput(activeSessionId, "\x02");
+      setTimeout(() => {
+        sendInput(activeSessionId, ":");
+        setTimeout(() => {
+          sendInput(activeSessionId, "set -g extended-keys off\n");
+        }, 50);
+      }, 50);
+    }, 300);
+  };
+
   const handleTmuxAttach = (name: string) => {
     if (!activeSessionId) return;
     sendInput(activeSessionId, `tmux attach -t ${name}\n`);
     setInTmux(activeSessionId, true);
     setActiveGroup(null);
+    ensureTmuxCompat();
   };
 
   const handleTmuxNew = () => {
@@ -294,6 +308,7 @@ export default function InputBox() {
     setTmuxNewName("");
     setInTmux(activeSessionId, true);
     setActiveGroup(null);
+    ensureTmuxCompat();
   };
 
   const handleTmuxDetach = () => {
@@ -630,11 +645,6 @@ export default function InputBox() {
       )}
       {activeGroup === TMUX_TAB && !inTmux && (
         <div className="border-b border-gray-700/50 bg-[#12122a] px-3 py-2">
-          {tmuxVersion && (tmuxVersion.startsWith("3.3") || tmuxVersion.startsWith("3.4")) && (
-            <div className="text-[10px] text-yellow-400 bg-yellow-900/20 border border-yellow-800/30 rounded px-2 py-1 mb-1.5">
-              tmux {tmuxVersion} has known key handling issues. Upgrade to 3.5+ or add <code className="text-yellow-300">set -g extended-keys off</code> to ~/.tmux.conf
-            </div>
-          )}
           {tmuxLoading ? (
             <span className="text-[11px] text-gray-500">Loading...</span>
           ) : tmuxSessions.length === 0 ? (