diff --git a/index.html b/index.html
index 1c4f7a7..ba715d2 100644
--- a/index.html
+++ b/index.html
@@ -103,7 +103,7 @@
 <script>
 const DEFAULT_MODEL='openai/gpt-4o',DEFAULT_API_KEY=''
 const el=Object.fromEntries(['chat','messages','composer','input','sendBtn','settingsBtnTop','settingsModal','settingsForm','closeSettings','cancelSettings','tabModel','tabPrompt','panelModel','panelPrompt','set_model','set_temperature','set_top_p','set_top_k','set_frequency_penalty','set_presence_penalty','set_repetition_penalty','set_min_p','set_top_a','set_system_prompt','deleteAssistantBtn','sidebar','sidebarOverlay','sidebarBtn','assistantList','newAssistantBtn','userMenuBtn','userMenu','apiKeyOption','assistantsImportOption','assistantsExportOption','threadsImportOption','threadsExportOption','threadsDedupOption','importInput','historyBtn','historyPanel','historyOverlay','historyList','closeHistory','historyMenu','footer'].map(id=>[id,document.getElementById(id)]))
-const clamp=(v,min,max)=>Math.max(min,Math.min(max,v)),num=(v,d)=>v==null||v===''||isNaN(+v)?d:+v,int=(v,d)=>v==null||v===''||isNaN(parseInt(v))?d:parseInt(v),gid=()=>Math.random().toString(36).slice(2,9),esc=s=>String(s).replace(/[&<>"'`]/g,c=>({"&":"&amp;","<":"&lt;",">":"&gt;","\"":"&quot;","'":"&#39;","`":"&#96;"}[c]))
+const clamp=(v,min,max)=>Math.max(min,Math.min(max,v)),num=(v,d)=>v==null||v===''||isNaN(+v)?d:+v,int=(v,d)=>v==null||v===''||isNaN(parseInt(v))?d:parseInt(v),gid=()=>Math.random().toString(36).slice(2,9),esc=s=>String(s).replace(/[&<>'"`]/g,c=>({"&":"&amp;","<":"&lt;",">":"&gt;","\"":"&quot;","'":"&#39;","`":"&#96;"}[c]))
 const globalStore={get apiKey(){return localStorage.getItem('openrouter_api_key')||DEFAULT_API_KEY||''},set apiKey(v){localStorage.setItem('openrouter_api_key',v||'')}}
 const as={key:'assistants_v1',activeKey:'active_assistant_id',load(){try{return JSON.parse(localStorage.getItem(this.key)||'[]')}catch{return[]}},save(list){localStorage.setItem(this.key,JSON.stringify(list||[]))},getActiveId(){return localStorage.getItem(this.activeKey)||null},setActiveId(id){localStorage.setItem(this.activeKey,id||'')}}
 let assistants=as.load()
@@ -111,49 +111,50 @@ if(!assistants.length){const def={id:gid(),name:'Default',settings:{model:DEFAUL
 const getActive=()=>assistants.find(a=>a.id===as.getActiveId())||assistants[0],createDefaultAssistant=()=>({id:gid(),name:'Default',settings:{model:DEFAULT_MODEL,temperature:1,top_p:1,top_k:0,frequency_penalty:0,presence_penalty:0,repetition_penalty:1,min_p:0,top_a:0,system_prompt:''}})
 const store=new Proxy({},{get(_,p){if(p==='apiKey')return globalStore.apiKey;const a=getActive();if(p==='model')return a.settings.model;if(p in a.settings)return a.settings[p];if(p==='system_prompt')return a.settings.system_prompt},set(_,p,v){if(p==='apiKey'){globalStore.apiKey=v;return true}const i=assistants.findIndex(a=>a.id===getActive().id);if(i>=0){if(p==='model')assistants[i].settings.model=v||DEFAULT_MODEL;else if(p==='system_prompt')assistants[i].settings.system_prompt=v||'';else assistants[i].settings[p]=v;as.save(assistants);return true}return false}})
 const state={messages:[],busy:false,controller:null,currentThreadId:null,abortRequested:false}
-const getModelShort=()=>{const m=store.model||'';return m.includes('/')?m.split('/').pop():m}
-function reflectActiveAssistant(){const a=getActive();el.settingsBtnTop.title=`Settings — ${a.name}`;if(window.lucide)lucide.createIcons()}
-function renderSidebar(){const activeId=as.getActiveId();el.assistantList.innerHTML=assistants.map(a=>`<button data-asst-id="${a.id}" class="w-full text-left px-3 py-2 hover:bg-gray-50 flex items-center gap-2 ${a.id===activeId?'bg-gray-100':''}"><span class="h-6 w-6 rounded-full bg-gray-200 flex items-center justify-center">🤖</span><span class="truncate">${esc(a.name)}</span></button>`).join('')}
+const getModelShort=m=>{const mm=m||store.model||'';return mm.includes('/')?mm.split('/').pop():mm}
+const reflectActiveAssistant=()=>{const a=getActive();el.settingsBtnTop.title=`Settings — ${a.name}`;if(window.lucide)lucide.createIcons()}
+const renderSidebar=()=>{const activeId=as.getActiveId();el.assistantList.innerHTML=assistants.map(a=>`<button data-asst-id="${a.id}" class="w-full text-left px-3 py-2 hover:bg-gray-50 flex items-center gap-2 ${a.id===activeId?'bg-gray-100':''}"><span class="h-6 w-6 rounded-full bg-gray-200 flex items-center justify-center">🤖</span><span class="truncate">${esc(a.name)}</span></button>`).join('')}
 function enhanceCodeBlocks(root,doHL=true){root.querySelectorAll('pre>code').forEach(code=>{if(code.textContent.length>200000)return;const pre=code.parentElement;pre.classList.add('relative','rounded-xl','border','border-gray-200');if(!pre.querySelector('.copy-btn')){const btn=document.createElement('button');btn.className='copy-btn';btn.textContent='Copy';btn.addEventListener('click',async e=>{e.stopPropagation();try{await navigator.clipboard.writeText(code.innerText);btn.textContent='Copied';setTimeout(()=>btn.textContent='Copy',1200)}catch{}});pre.appendChild(btn)}if(doHL&&window.hljs&&code.textContent.length<100000)hljs.highlightElement(code)})}
 const md=window.markdownit({html:false,linkify:true,typographer:true,breaks:true})
+const getAssistantLabel=m=>{const name=(m&&m.assistant_name)||getActive().name,modelShort=getModelShort(m&&m.model);return `${name} · ${modelShort}`}
+function msgRow(m){const role=typeof m==='string'?m:(m&&m.role)||'assistant';const meta=typeof m==='string'?{}:m||{};const row=document.createElement('div');row.className='flex flex-col gap-2';const head=document.createElement('div');head.className='flex items-center gap-2 px-4';const avatar=document.createElement('div');avatar.className=(role==='user'?'bg-gray-900 text-white':'bg-gray-200 text-gray-900')+' msg-avatar shrink-0 h-7 w-7 rounded-full flex items-center justify-center';avatar.textContent=role==='user'?'🧑':'🤖';const name=document.createElement('div');name.className='text-xs font-medium text-gray-500';name.textContent=role==='user'?'You':getAssistantLabel(meta);head.appendChild(avatar);head.appendChild(name);const bubble=document.createElement('div');bubble.className=(role==='user'?'bg-gray-50 border border-gray-200':'bg-gray-100')+' msg-bubble markdown-body rounded-none px-4 py-3 w-full';row.appendChild(head);row.appendChild(bubble);el.messages.appendChild(row);queueMicrotask(()=>el.chat.scrollTo({top:el.chat.scrollHeight,behavior:'smooth'}));return bubble}
 function renderMarkdown(node,text,opt={enhance:true,highlight:true}){node.innerHTML=md.render(text);if(opt.enhance)enhanceCodeBlocks(node,opt.highlight)}
-function msgRow(role){const row=document.createElement('div');row.className='flex flex-col gap-2';const head=document.createElement('div');head.className='flex items-center gap-2 px-4';const avatar=document.createElement('div');avatar.className=(role==='user'?'bg-gray-900 text-white':'bg-gray-200 text-gray-900')+' msg-avatar shrink-0 h-7 w-7 rounded-full flex items-center justify-center';avatar.textContent=role==='user'?'🧑':'🤖';const name=document.createElement('div');name.className='text-xs font-medium text-gray-500';name.textContent=role==='user'?'You':getModelShort();head.appendChild(avatar);head.appendChild(name);const bubble=document.createElement('div');bubble.className=(role==='user'?'bg-gray-50 border border-gray-200':'bg-gray-100')+' msg-bubble markdown-body rounded-none px-4 py-3 w-full';row.appendChild(head);row.appendChild(bubble);el.messages.appendChild(row);queueMicrotask(()=>el.chat.scrollTo({top:el.chat.scrollHeight,behavior:'smooth'}));return bubble}
-function addMessage(role,content,track=true){const bubble=msgRow(role);renderMarkdown(bubble,content);if(track)state.messages.push({role,content});return bubble}
-function addAssistantBubbleStreaming(){return msgRow('assistant')}
-function clearChat(){state.messages=[];el.messages.innerHTML=''}
+function addMessage(m,track=true){const bubble=msgRow(m);renderMarkdown(bubble,m.content);if(track)state.messages.push(m);return bubble}
+const addAssistantBubbleStreaming=meta=>msgRow(Object.assign({role:'assistant'},meta))
+const clearChat=()=>{state.messages=[];el.messages.innerHTML=''}
 const payloadWithSampling=b=>Object.assign({},b,{temperature:store.temperature,top_p:store.top_p,top_k:store.top_k,frequency_penalty:store.frequency_penalty,presence_penalty:store.presence_penalty,repetition_penalty:store.repetition_penalty,min_p:store.min_p,top_a:store.top_a})
 function setBtnStop(){const b=el.sendBtn;b.dataset.mode='stop';b.type='button';b.setAttribute('aria-label','Stop');b.innerHTML='<svg viewBox="0 0 24 24" class="h-5 w-5" fill="currentColor"><rect x="7" y="7" width="10" height="10" rx="1"/></svg>';b.onclick=()=>{state.abortRequested=true;state.controller?.abort?.()}}
 function setBtnSend(){const b=el.sendBtn;b.dataset.mode='send';b.type='submit';b.setAttribute('aria-label','Send');b.innerHTML='<svg viewBox="0 0 24 24" class="h-5 w-5" fill="none" stroke="currentColor" stroke-width="1.8"><path stroke-linecap="round" stroke-linejoin="round" d="M5 12h14M12 5l7 7-7 7"/></svg>';b.onclick=null}
-async function askOpenRouterStreaming(onDelta){const apiKey=store.apiKey,model=store.model;if(!apiKey){const text=localDemoReply(state.messages[state.messages.length-1]?.content||'');onDelta(text,true);return {ok:true,text}}try{state.controller=new AbortController();const msgs=[];if(store.system_prompt)msgs.push({role:'system',content:store.system_prompt});msgs.push(...state.messages.filter(m=>m.role!=='system'));const body=payloadWithSampling({model,messages:msgs,stream:true});const res=await fetch('https://openrouter.ai/api/v1/chat/completions',{method:'POST',headers:{'Content-Type':'application/json','Authorization':'Bearer '+apiKey},body:JSON.stringify(body),signal:state.controller.signal});if(!res.ok){const errText=await res.text().catch(()=> '');throw new Error(errText||('HTTP '+res.status))}const reader=res.body.getReader(),decoder=new TextDecoder('utf-8');let buffer='',full='',finished=false;const doneOnce=()=>{if(finished)return;finished=true;onDelta('',true)};while(true){const {value,done}=await reader.read();if(done)break;buffer+=decoder.decode(value,{stream:true});let idx;while((idx=buffer.indexOf('\n\n'))!==-1){const chunk=buffer.slice(0,idx).trim();buffer=buffer.slice(idx+2);if(!chunk)continue;if(chunk.startsWith('data:')){const data=chunk.slice(5).trim();if(data==='[DONE]'){doneOnce();continue}try{const json=JSON.parse(data);const delta=json.choices?.[0]?.delta?.content??'';if(delta){full+=delta;onDelta(delta,false)}const finish=json.choices?.[0]?.finish_reason;if(finish)doneOnce()}catch{}}}}doneOnce();return {ok:true,text:full}}catch(e){const msg=String(e?.message||e),aborted=e?.name==='AbortError'||/abort/i.test(msg)||state.controller?.signal?.aborted||state.abortRequested;if(aborted){onDelta('',true);return {ok:false,text:'',aborted:true}}let hint='Request failed.';if(/401|unauthorized/i.test(msg))hint='Unauthorized (check API key).';else if(/429|rate/i.test(msg))hint='Rate limited (slow down or upgrade).';else if(/access|forbidden|403/i.test(msg))hint='Forbidden (model or key scope).';const fallback='\n\n'+hint;onDelta(fallback,true);return {ok:false,text:fallback}}finally{state.controller=null;state.abortRequested=false}}
+async function askOpenRouterStreaming(onDelta){const apiKey=store.apiKey,model=store.model;if(!apiKey){const text=localDemoReply(state.messages[state.messages.length-1]?.content||'');onDelta(text,true);return {ok:true,text}}try{state.controller=new AbortController();const msgs=[];if(store.system_prompt)msgs.push({role:'system',content:store.system_prompt});msgs.push(...state.messages.filter(m=>m.role!=='system').map(m=>({role:m.role,content:m.content})));const body=payloadWithSampling({model,messages:msgs,stream:true});const res=await fetch('https://openrouter.ai/api/v1/chat/completions',{method:'POST',headers:{'Content-Type':'application/json','Authorization':'Bearer '+apiKey},body:JSON.stringify(body),signal:state.controller.signal});if(!res.ok){const errText=await res.text().catch(()=> '');throw new Error(errText||('HTTP '+res.status))}const reader=res.body.getReader(),decoder=new TextDecoder('utf-8');let buffer='',full='',finished=false;const doneOnce=()=>{if(finished)return;finished=true;onDelta('',true)};while(true){const {value,done}=await reader.read();if(done)break;buffer+=decoder.decode(value,{stream:true});let idx;while((idx=buffer.indexOf('\n\n'))!==-1){const chunk=buffer.slice(0,idx).trim();buffer=buffer.slice(idx+2);if(!chunk)continue;if(chunk.startsWith('data:')){const data=chunk.slice(5).trim();if(data==='[DONE]'){doneOnce();continue}try{const json=JSON.parse(data);const delta=json.choices?.[0]?.delta?.content??'';if(delta){full+=delta;onDelta(delta,false)}const finish=json.choices?.[0]?.finish_reason;if(finish)doneOnce()}catch{}}}}doneOnce();return {ok:true,text:full}}catch(e){const msg=String(e?.message||e),aborted=e?.name==='AbortError'||/abort/i.test(msg)||state.controller?.signal?.aborted||state.abortRequested;if(aborted){onDelta('',true);return {ok:false,text:'',aborted:true}}let hint='Request failed.';if(/401|unauthorized/i.test(msg))hint='Unauthorized (check API key).';else if(/429|rate/i.test(msg))hint='Rate limited (slow down or upgrade).';else if(/access|forbidden|403/i.test(msg))hint='Forbidden (model or key scope).';const fallback='\n\n'+hint;onDelta(fallback,true);return {ok:false,text:fallback}}finally{state.controller=null;state.abortRequested=false}}
 function localDemoReply(prompt){const tips=['Tip: open the sidebar → Account & Backup to set your OpenRouter API key.','Click 🤖 to change model & sampling.','New chats are stateless here—no history is kept.'],tip=tips[Math.floor(Math.random()*tips.length)],mirrored=prompt.split(/\s+/).slice(0,24).join(' ');return `Local demo mode. You said: "${mirrored}"\n\n${tip}`}
-function openSidebar(){el.sidebar.classList.remove('-translate-x-full');el.sidebarOverlay.classList.remove('hidden')}
-function closeSidebar(){el.sidebar.classList.add('-translate-x-full');el.sidebarOverlay.classList.add('hidden')}
+const openSidebar=()=>{el.sidebar.classList.remove('-translate-x-full');el.sidebarOverlay.classList.remove('hidden')}
+const closeSidebar=()=>{el.sidebar.classList.add('-translate-x-full');el.sidebarOverlay.classList.add('hidden')}
 el.sidebarBtn.addEventListener('click',openSidebar)
 el.sidebarOverlay.addEventListener('click',()=>{closeSidebar();closeHistory();hideHistoryMenu()})
 const idb={db:null,open(){return new Promise((res,rej)=>{const r=indexedDB.open('chat_history_v1',1);r.onupgradeneeded=()=>{r.result.createObjectStore('threads',{keyPath:'id'})};r.onsuccess=()=>{this.db=r.result;res()};r.onerror=()=>rej(r.error)})},all(){return new Promise((res,rej)=>{const tx=this.db.transaction('threads').objectStore('threads').getAll();tx.onsuccess=()=>res(tx.result||[]);tx.onerror=()=>rej(tx.error)})},get(id){return new Promise((res,rej)=>{const tx=this.db.transaction('threads').objectStore('threads').get(id);tx.onsuccess=()=>res(tx.result||null);tx.onerror=()=>rej(tx.error)})},put(v){return new Promise((res,rej)=>{const tx=this.db.transaction('threads','readwrite').objectStore('threads').put(v);tx.onsuccess=()=>res();tx.onerror=()=>rej(tx.error)})},del(id){return new Promise((res,rej)=>{const tx=this.db.transaction('threads','readwrite').objectStore('threads').delete(id);tx.onsuccess=()=>res();tx.onerror=()=>rej(tx.error)})}}
 let threads=[];const titleFrom=t=>(t||'').replace(/\s+/g,' ').trim().slice(0,60)||'Untitled'
 async function ensureThreadOnFirstUser(text){let needNew=!state.currentThreadId;if(state.messages.length===0)state.currentThreadId=null;if(state.currentThreadId){const existing=await idb.get(state.currentThreadId);if(!existing)needNew=true}if(!needNew)return;const id=gid(),now=Date.now();const th={id,title:titleFrom(text),pinned:false,createdAt:now,updatedAt:now,messages:[]};state.currentThreadId=id;threads.unshift(th);await idb.put(th);await renderHistory()}
 async function persistThread(){if(!state.currentThreadId)return;let th=threads.find(x=>x.id===state.currentThreadId)||await idb.get(state.currentThreadId);if(!th)return;th.messages=[...state.messages];th.updatedAt=Date.now();th.title=titleFrom(th.messages.find(m=>m.role==='user')?.content||th.title);await idb.put(th);await renderHistory()}
-function historyRow(t){return `<div class=\"relative flex items-center gap-2 px-3 py-2 ${t.pinned?'bg-yellow-50':''}\"><button data-open-thread=\"${t.id}\" class=\"flex-1 text-left truncate\">${t.pinned?'📌 ':''}${esc(t.title)}</button><button data-thread-menu=\"${t.id}\" class=\"h-8 w-8 rounded hover:bg-gray-100 flex items-center justify-center\" title=\"More\"><i data-lucide=\"more-horizontal\" class=\"h-4 w-4\"></i></button></div>`}
+const historyRow=t=>`<div class=\"relative flex items-center gap-2 px-3 py-2 ${t.pinned?'bg-yellow-50':''}\"><button data-open-thread=\"${t.id}\" class=\"flex-1 text-left truncate\">${t.pinned?'📌 ':''}${esc(t.title)}</button><button data-thread-menu=\"${t.id}\" class=\"h-8 w-8 rounded hover:bg-gray-100 flex items-center justify-center\" title=\"More\"><i data-lucide=\"more-horizontal\" class=\"h-4 w-4\"></i></button></div>`
 async function renderHistory(){threads=(await idb.all()).sort((a,b)=>(b.pinned-a.pinned)||(b.updatedAt-a.updatedAt));el.historyList.innerHTML=threads.map(historyRow).join('');if(window.lucide)lucide.createIcons()}
-function openHistory(){el.historyPanel.classList.remove('translate-x-full');el.historyOverlay.classList.remove('hidden');renderHistory()}
-function closeHistory(){el.historyPanel.classList.add('translate-x-full');el.historyOverlay.classList.add('hidden')}
+const openHistory=()=>{el.historyPanel.classList.remove('translate-x-full');el.historyOverlay.classList.remove('hidden');renderHistory()}
+const closeHistory=()=>{el.historyPanel.classList.add('translate-x-full');el.historyOverlay.classList.add('hidden')}
 el.historyBtn.addEventListener('click',openHistory);el.historyOverlay.addEventListener('click',closeHistory);el.closeHistory.addEventListener('click',closeHistory)
-let menuThreadId=null;function hideHistoryMenu(){el.historyMenu.classList.add('hidden');menuThreadId=null}
+let menuThreadId=null;const hideHistoryMenu=()=>{el.historyMenu.classList.add('hidden');menuThreadId=null}
 function showHistoryMenu(btn,id){menuThreadId=id;const r=btn.getBoundingClientRect();el.historyMenu.style.top=(r.bottom+4)+'px';el.historyMenu.style.left=Math.min(window.innerWidth-220,r.right-200)+'px';el.historyMenu.classList.remove('hidden');if(window.lucide)lucide.createIcons()}
-el.historyList.addEventListener('click',async e=>{const openBtn=e.target.closest('[data-open-thread]'),menuBtn=e.target.closest('[data-thread-menu]');if(openBtn){const id=openBtn.getAttribute('data-open-thread'),th=threads.find(t=>t.id===id)||await idb.get(id);if(!th)return;state.currentThreadId=id;clearChat();state.messages=Array.isArray(th.messages)?[...th.messages]:[];for(const m of state.messages){const b=msgRow(m.role);renderMarkdown(b,m.content)}queueMicrotask(()=>el.chat.scrollTo({top:el.chat.scrollHeight,behavior:'smooth'}));closeHistory();hideHistoryMenu();return}if(menuBtn){e.stopPropagation();showHistoryMenu(menuBtn,menuBtn.getAttribute('data-thread-menu'))}})
+el.historyList.addEventListener('click',async e=>{const openBtn=e.target.closest('[data-open-thread]'),menuBtn=e.target.closest('[data-thread-menu]');if(openBtn){const id=openBtn.getAttribute('data-open-thread'),th=threads.find(t=>t.id===id)||await idb.get(id);if(!th)return;state.currentThreadId=id;clearChat();state.messages=Array.isArray(th.messages)?[...th.messages]:[];for(const m of state.messages){const b=msgRow(m);renderMarkdown(b,m.content)}queueMicrotask(()=>el.chat.scrollTo({top:el.chat.scrollHeight,behavior:'smooth'}));closeHistory();hideHistoryMenu();return}if(menuBtn){e.stopPropagation();showHistoryMenu(menuBtn,menuBtn.getAttribute('data-thread-menu'))}})
 document.addEventListener('click',e=>{if(!el.historyMenu.contains(e.target)&&!e.target.closest('[data-thread-menu]'))hideHistoryMenu();if(!el.userMenu.contains(e.target)&&!el.userMenuBtn.contains(e.target))el.userMenu.classList.add('hidden')})
 el.historyMenu.addEventListener('click',async e=>{const act=e.target.closest('[data-action]')?.getAttribute('data-action');if(!act||!menuThreadId)return;const th=threads.find(t=>t.id===menuThreadId)||await idb.get(menuThreadId);if(!th)return;if(act==='pin'){th.pinned=!th.pinned;await idb.put(th)}else if(act==='rename'){const nv=prompt('Rename to:',th.title);if(nv!=null){th.title=titleFrom(nv);await idb.put(th)}}else if(act==='delete'){if(confirm('Delete this chat?')){await idb.del(th.id);if(state.currentThreadId===th.id){state.currentThreadId=null;clearChat()}}}hideHistoryMenu();renderHistory()})
 const raf=(fn=>{let id=null;return()=>{if(id)cancelAnimationFrame(id);id=requestAnimationFrame(()=>{id=null;fn()})}})
 const big=()=>el.input.value.length>5000||el.input.value.split('\n').length>200
 const fit=()=>{const large=big();el.input.style.overflowY=large?'auto':'hidden';el.input.style.height='auto';el.input.style.height=(large?160:Math.min(el.input.scrollHeight,160))+'px'}
 const fitRAF=raf(fit)
-el.composer.addEventListener('submit',async e=>{e.preventDefault();if(state.busy)return;const text=el.input.value.trim();if(!text)return;if(state.messages.length===0)state.currentThreadId=null;await ensureThreadOnFirstUser(text);el.input.value='';fit();addMessage('user',text);state.busy=true;setBtnStop();const assistantBubble=addAssistantBubbleStreaming();let buf='',completed=false;await askOpenRouterStreaming((delta,done)=>{buf+=delta;renderMarkdown(assistantBubble,buf,{enhance:false});if(done&&!completed){completed=true;setBtnSend();state.busy=false;enhanceCodeBlocks(assistantBubble,true);state.messages.push({role:'assistant',content:buf});persistThread();queueMicrotask(()=>el.chat.scrollTo({top:el.chat.scrollHeight,behavior:'smooth'}))}})})
+el.composer.addEventListener('submit',async e=>{e.preventDefault();if(state.busy)return;const text=el.input.value.trim();if(!text)return;if(state.messages.length===0)state.currentThreadId=null;await ensureThreadOnFirstUser(text);el.input.value='';fit();addMessage({role:'user',content:text});state.busy=true;setBtnStop();const assistantMeta={assistant_name:getActive().name,model:store.model};const assistantBubble=addAssistantBubbleStreaming(assistantMeta);let buf='',completed=false;await askOpenRouterStreaming((delta,done)=>{buf+=delta;renderMarkdown(assistantBubble,buf,{enhance:false});if(done&&!completed){completed=true;setBtnSend();state.busy=false;enhanceCodeBlocks(assistantBubble,true);state.messages.push({role:'assistant',content:buf,...assistantMeta});persistThread();queueMicrotask(()=>el.chat.scrollTo({top:el.chat.scrollHeight,behavior:'smooth'}))}})})
 el.messages.addEventListener('click',e=>{if(e.target.closest('.msg-avatar'))openSidebar()})
 el.input.addEventListener('input',fitRAF)
 el.input.addEventListener('paste',()=>setTimeout(fit,0))
 function openSettings(){const a=getActive(),s=a.settings;el.set_model.value=s.model;el.set_temperature.value=s.temperature;el.set_top_p.value=s.top_p;el.set_top_k.value=s.top_k;el.set_frequency_penalty.value=s.frequency_penalty;el.set_presence_penalty.value=s.presence_penalty;el.set_repetition_penalty.value=s.repetition_penalty;el.set_min_p.value=s.min_p;el.set_top_a.value=s.top_a;el.set_system_prompt.value=s.system_prompt;showModelTab();el.settingsModal.classList.remove('hidden')}
-function closeSettings(){el.settingsModal.classList.add('hidden')}
+const closeSettings=()=>{el.settingsModal.classList.add('hidden')}
 function showModelTab(){el.tabModel.classList.add('border-black');el.tabPrompt.classList.remove('border-black');el.panelModel.classList.remove('hidden');el.panelPrompt.classList.add('hidden')}
 function showPromptTab(){el.tabPrompt.classList.add('border-black');el.tabModel.classList.remove('border-black');el.panelPrompt.classList.remove('hidden');el.panelModel.classList.add('hidden')}
 el.settingsBtnTop.addEventListener('click',openSettings)
@@ -166,11 +167,11 @@ el.settingsForm.addEventListener('submit',e=>{e.preventDefault();const a=getActi
 el.deleteAssistantBtn.addEventListener('click',()=>{const activeId=as.getActiveId(),active=getActive(),name=active?.name||'this assistant';if(!confirm(`Delete "${name}"?`))return;assistants=assistants.filter(a=>a.id!==activeId);as.save(assistants);if(assistants.length===0){const def=createDefaultAssistant();assistants=[def];as.save(assistants);as.setActiveId(def.id)}else{as.setActiveId(assistants[0].id)}renderSidebar();reflectActiveAssistant();state.currentThreadId=null;clearChat();closeSettings()})
 el.newAssistantBtn.addEventListener('click',()=>{const name=prompt('Name your assistant:');if(!name)return;const id=gid();assistants.unshift({id,name:name.trim(),settings:{model:DEFAULT_MODEL,temperature:1,top_p:1,top_k:0,frequency_penalty:0,presence_penalty:0,repetition_penalty:1,min_p:0,top_a:0,system_prompt:''}});as.save(assistants);as.setActiveId(id);renderSidebar();reflectActiveAssistant();state.currentThreadId=null;clearChat();closeSidebar()})
 el.assistantList.addEventListener('click',e=>{const btn=e.target.closest('[data-asst-id]');if(!btn)return;const id=btn.getAttribute('data-asst-id');if(id){as.setActiveId(id);renderSidebar();reflectActiveAssistant();state.currentThreadId=null;clearChat();closeSidebar()}})
-function toggleUserMenu(show){if(show===true)el.userMenu.classList.remove('hidden');else if(show===false)el.userMenu.classList.add('hidden');else el.userMenu.classList.toggle('hidden')}
+const toggleUserMenu=show=>{if(show===true)el.userMenu.classList.remove('hidden');else if(show===false)el.userMenu.classList.add('hidden');else el.userMenu.classList.toggle('hidden')}
 el.userMenuBtn.addEventListener('click',e=>{e.stopPropagation();toggleUserMenu()})
 el.apiKeyOption.addEventListener('click',()=>{toggleUserMenu(false);const cur=store.apiKey?'********':'';const input=prompt('Enter OpenRouter API key (stored locally):',cur);if(input!==null){store.apiKey=input==='********'?store.apiKey:input.trim();alert(store.apiKey?'API key saved locally.':'API key cleared.')}})
 function dl(name,obj){const blob=new Blob([JSON.stringify(obj,null,2)],{type:'application/json'}),url=URL.createObjectURL(blob),a=document.createElement('a');a.href=url;a.download=name;document.body.appendChild(a);a.click();a.remove();URL.revokeObjectURL(url)}
-function ts(){const d=new Date(),p=n=>String(n).padStart(2,'0');return `${d.getFullYear()}${p(d.getMonth()+1)}${p(d.getDate())}-${p(d.getHours())}${p(d.getMinutes())}${p(d.getSeconds())}`}
+const ts=()=>{const d=new Date(),p=n=>String(n).padStart(2,'0');return `${d.getFullYear()}${p(d.getMonth()+1)}${p(d.getDate())}-${p(d.getHours())}${p(d.getMinutes())}${p(d.getSeconds())}`}
 let importMode=null
 el.assistantsExportOption.addEventListener('click',()=>{const payload={version:1,assistants,activeId:as.getActiveId()};dl(`assistants-${ts()}.json`,payload);toggleUserMenu(false)})
 el.assistantsImportOption.addEventListener('click',()=>{importMode='assistants';el.importInput.value='';el.importInput.click()})