async function send(){
  const text=$('msg').value.trim();
  if(!text&&!S.pendingFiles.length)return;
  // Don't send while an inline message edit is active
  if(document.querySelector('.msg-edit-area'))return;
  // If busy, queue the message instead of dropping it
  if(S.busy){
    if(text){
      MSG_QUEUE.push(text);
      $('msg').value='';autoResize();
      updateQueueBadge();
      showToast(`Queued: "${text.slice(0,40)}${text.length>40?'\u2026':''}"`,2000);
    }
    return;
  }
  if(!S.session){await newSession();await renderSessionList();}

  const activeSid=S.session.session_id;

  setStatus(S.pendingFiles&&S.pendingFiles.length?'Uploading…':'Sending…');
  let uploaded=[];
  try{uploaded=await uploadPendingFiles();}
  catch(e){if(!text){setStatus(`❌ ${e.message}`);return;}}

  let msgText=text;
  if(uploaded.length&&!msgText)msgText=`I've uploaded ${uploaded.length} file(s): ${uploaded.join(', ')}`;
  else if(uploaded.length)msgText=`${text}\n\n[Attached files: ${uploaded.join(', ')}]`;
  if(!msgText){setStatus('Nothing to send');return;}

  $('msg').value='';autoResize();
  const displayText=text||(uploaded.length?`Uploaded: ${uploaded.join(', ')}`:'(file upload)');
  const userMsg={role:'user',content:displayText,attachments:uploaded.length?uploaded:undefined};
  S.toolCalls=[];  // clear tool calls from previous turn
  clearLiveToolCards();  // clear any leftover live cards from last turn
  S.messages.push(userMsg);renderMessages();appendThinking();setBusy(true);  // activity bar shown via setBusy
  INFLIGHT[activeSid]={messages:[...S.messages],uploaded};
  startApprovalPolling(activeSid);
  S.activeStreamId = null;  // will be set after stream starts

  // Set provisional title from user message immediately so session appears
  // in the sidebar right away with a meaningful name (server may refine later)
  if(S.session&&(S.session.title==='Untitled'||!S.session.title)){
    const provisionalTitle=displayText.slice(0,64);
    S.session.title=provisionalTitle;
    syncTopbar();
    // Persist it and refresh the sidebar now -- don't wait for done
    api('/api/session/rename',{method:'POST',body:JSON.stringify({
      session_id:activeSid, title:provisionalTitle
    })}).catch(()=>{});  // fire-and-forget, server refines on done
    renderSessionList();  // session appears in sidebar immediately
  } else {
    renderSessionList();  // ensure it's visible even if already titled
  }

  // Start the agent via POST, get a stream_id back
  let streamId;
  try{
    const startData=await api('/api/chat/start',{method:'POST',body:JSON.stringify({
      session_id:activeSid,message:msgText,
      model:S.session.model||$('modelSelect').value,workspace:S.session.workspace,
      attachments:uploaded.length?uploaded:undefined
    })});
    streamId=startData.stream_id;
    S.activeStreamId = streamId;
    markInflight(activeSid, streamId);
    // Show Cancel button
    const cancelBtn=$('btnCancel');
    if(cancelBtn) cancelBtn.style.display='';
  }catch(e){
    delete INFLIGHT[activeSid];
    stopApprovalPolling();
    // Only hide approval card if it belongs to the session that just finished
    if(!_approvalSessionId || _approvalSessionId===activeSid) hideApprovalCard();removeThinking();
    S.messages.push({role:'assistant',content:`**Error:** ${e.message}`});
    renderMessages();setBusy(false);setStatus('Error: '+e.message);
    return;
  }

  // Open SSE stream and render tokens live
  let assistantText='';
  let assistantRow=null;
  let assistantBody=null;

  function ensureAssistantRow(){
    if(assistantRow)return;
    removeThinking();
    const tr=$('toolRunningRow');if(tr)tr.remove();
    $('emptyState').style.display='none';
    assistantRow=document.createElement('div');assistantRow.className='msg-row';
    assistantBody=document.createElement('div');assistantBody.className='msg-body';
    const role=document.createElement('div');role.className='msg-role assistant';
    const icon=document.createElement('div');icon.className='role-icon assistant';icon.textContent='H';
    const lbl=document.createElement('span');lbl.style.fontSize='12px';lbl.textContent='Hermes';
    role.appendChild(icon);role.appendChild(lbl);
    assistantRow.appendChild(role);assistantRow.appendChild(assistantBody);
    $('msgInner').appendChild(assistantRow);
  }

  const es=new EventSource(`/api/chat/stream?stream_id=${encodeURIComponent(streamId)}`);

  es.addEventListener('token',e=>{
    // Guard: if the user switched sessions, don't write tokens to the wrong DOM
    if(!S.session||S.session.session_id!==activeSid) return;
    const d=JSON.parse(e.data);
    assistantText+=d.text;
    ensureAssistantRow();
    assistantBody.innerHTML=renderMd(assistantText);
    $('messages').scrollTop=$('messages').scrollHeight;
  });

  es.addEventListener('tool',e=>{
    const d=JSON.parse(e.data);
    // Only update activity bar if viewing this session
    if(S.session&&S.session.session_id===activeSid){
      setStatus(`${d.name}${d.preview?' · '+d.preview.slice(0,55):''}`);
    }
    if(!S.session||S.session.session_id!==activeSid) return;
    removeThinking();
    const oldRow=$('toolRunningRow');if(oldRow)oldRow.remove();
    // Append card to the stable live container -- no renderMessages() call
    const tc={name:d.name, preview:d.preview||'', args:d.args||{}, snippet:'', done:false};
    S.toolCalls.push(tc);
    appendLiveToolCard(tc);
    $('messages').scrollTop=$('messages').scrollHeight;
  });

  es.addEventListener('approval',e=>{
    const d=JSON.parse(e.data);
    // Tag the approval with the session that owns it so respondApproval uses correct sid
    d._session_id=activeSid;
    showApprovalCard(d);
  });

  es.addEventListener('done',e=>{
    es.close();
    const d=JSON.parse(e.data);
    delete INFLIGHT[activeSid];
    clearInflight();
    stopApprovalPolling();
    // Only hide approval card if it belongs to the session that just finished
    if(!_approvalSessionId || _approvalSessionId===activeSid) hideApprovalCard();
    // Only clear active stream state if this is the currently viewed session
    if(S.session&&S.session.session_id===activeSid){
      S.activeStreamId=null;
      const _cb=$('btnCancel');if(_cb)_cb.style.display='none';
    }
    if(S.session&&S.session.session_id===activeSid){
      S.session=d.session;S.messages=d.session.messages||[];
      // Populate tool calls from server-extracted metadata (has snippets)
      if(d.session.tool_calls&&d.session.tool_calls.length){
        S.toolCalls=d.session.tool_calls.map(tc=>({...tc,done:true}));
      } else {
        S.toolCalls=S.toolCalls.map(tc=>({...tc,done:true}));
      }
      if(uploaded.length){
        const lastUser=[...S.messages].reverse().find(m=>m.role==='user');
        if(lastUser)lastUser.attachments=uploaded;
      }
      clearLiveToolCards();
      // Set S.busy=false BEFORE renderMessages so the settled tool card
      // block (!S.busy guard) can render the final grouped cards.
      S.busy=false;
      syncTopbar();renderMessages();loadDir('.');
    }
    renderSessionList();setBusy(false);setStatus('');
  });

  es.addEventListener('error',e=>{
    es.close();
    delete INFLIGHT[activeSid];
    clearInflight();
    stopApprovalPolling();
    // Only hide approval card if it belongs to the session that just finished
    if(!_approvalSessionId || _approvalSessionId===activeSid) hideApprovalCard();
    if(S.session&&S.session.session_id===activeSid){
      S.activeStreamId=null;
      const _cbe=$('btnCancel');if(_cbe)_cbe.style.display='none';
    }
    let msg='Connection error';
    try{const d=JSON.parse(e.data);msg=d.message||msg;}catch(_){}
    if(S.session&&S.session.session_id===activeSid){
      clearLiveToolCards();
      if(!assistantText){removeThinking();}
      S.messages.push({role:'assistant',content:`**Error:** ${msg}`});
      renderMessages();
    }
    if(!S.session || !INFLIGHT[S.session.session_id]){
      setBusy(false);setStatus('Error: '+msg);
    }
  });

  es.addEventListener('cancel',e=>{
    es.close();
    delete INFLIGHT[activeSid];
    clearInflight();
    stopApprovalPolling();
    // Only hide approval card if it belongs to the session that just finished
    if(!_approvalSessionId || _approvalSessionId===activeSid) hideApprovalCard();
    if(S.session&&S.session.session_id===activeSid){
      S.activeStreamId=null;
      const _cbc=$('btnCancel');if(_cbc)_cbc.style.display='none';
    }
    if(S.session&&S.session.session_id===activeSid){
      clearLiveToolCards();
      if(!assistantText){removeThinking();}
      S.messages.push({role:'assistant',content:'*Task cancelled.*'});
      renderMessages();
    }
    renderSessionList();
    if(!S.session || !INFLIGHT[S.session.session_id]){
      setBusy(false);setStatus('');
    }
  });

  // Handle SSE connection errors (network drop etc)
  es.onerror=()=>{
    if(es.readyState===EventSource.CLOSED){
      delete INFLIGHT[activeSid];
      stopApprovalPolling();
    // Only hide approval card if it belongs to the session that just finished
    if(!_approvalSessionId || _approvalSessionId===activeSid) hideApprovalCard();
      if(S.session&&S.session.session_id===activeSid){
        S.activeStreamId=null;
        const _cbo=$('btnCancel');if(_cbo)_cbo.style.display='none';
      }
      if(!assistantText&&S.session&&S.session.session_id===activeSid){
        removeThinking();
        S.messages.push({role:'assistant',content:'**Error:** Connection lost'});
        renderMessages();
      }
      if(!S.session || !INFLIGHT[S.session.session_id]){
        setBusy(false);setStatus('');
      }
    }
  };
}

function transcript(){
  const lines=[`# Hermes session ${S.session?.session_id||''}`,``,
    `Workspace: ${S.session?.workspace||''}`,`Model: ${S.session?.model||''}`,``];
  for(const m of S.messages){
    if(!m||m.role==='tool')continue;
    let c=m.content||'';
    if(Array.isArray(c))c=c.filter(p=>p&&p.type==='text').map(p=>p.text||'').join('\n');
    const ct=String(c).trim();
    if(!ct&&!m.attachments?.length)continue;
    const attach=m.attachments?.length?`\n\n_Files: ${m.attachments.join(', ')}_`:'';
    lines.push(`## ${m.role}`,'',ct+attach,'');
  }
  return lines.join('\n');
}

function autoResize(){const el=$('msg');el.style.height='auto';el.style.height=Math.min(el.scrollHeight,200)+'px';}


// ── Approval polling ──
let _approvalPollTimer = null;

// showApprovalCard moved above respondApproval

function hideApprovalCard() {
  $("approvalCard").classList.remove("visible");
  $("approvalCmd").textContent = "";
  $("approvalDesc").textContent = "";
}

// Track session_id of the active approval so respond goes to the right session
let _approvalSessionId = null;

function showApprovalCard(pending) {
  $("approvalDesc").textContent = pending.description || "";
  $("approvalCmd").textContent = pending.command || "";
  const keys = pending.pattern_keys || (pending.pattern_key ? [pending.pattern_key] : []);
  $("approvalDesc").textContent = (pending.description || "") + (keys.length ? " [" + keys.join(", ") + "]" : "");
  _approvalSessionId = pending._session_id || (S.session && S.session.session_id) || null;
  $("approvalCard").classList.add("visible");
}

async function respondApproval(choice) {
  const sid = _approvalSessionId || (S.session && S.session.session_id);
  if (!sid) return;
  hideApprovalCard();
  _approvalSessionId = null;
  try {
    await api("/api/approval/respond", {
      method: "POST",
      body: JSON.stringify({ session_id: sid, choice })
    });
  } catch(e) { setStatus("Approval error: " + e.message); }
}

function startApprovalPolling(sid) {
  stopApprovalPolling();
  _approvalPollTimer = setInterval(async () => {
    if (!S.busy || !S.session || S.session.session_id !== sid) {
      stopApprovalPolling(); hideApprovalCard(); return;
    }
    try {
      const data = await api("/api/approval/pending?session_id=" + encodeURIComponent(sid));
      if (data.pending) { data.pending._session_id=sid; showApprovalCard(data.pending); }
      else { hideApprovalCard(); }
    } catch(e) { /* ignore poll errors */ }
  }, 1500);
}

function stopApprovalPolling() {
  if (_approvalPollTimer) { clearInterval(_approvalPollTimer); _approvalPollTimer = null; }
}
// ── Panel navigation (Chat / Tasks / Skills / Memory) ──