diff --git a/index.html b/index.html
index 3a35db1..ce32a67 100644
--- a/index.html
+++ b/index.html
@@ -29,10 +29,7 @@
     <div class="justify-self-end"><button id="historyBtn" class="h-8 w-8 rounded-xl bg-gray-100 hover:bg-gray-200 active:scale-[.99] transition flex items-center justify-center" title="Threads"><i data-lucide="panel-right" class="h-5 w-5"></i></button></div>
   </div>
 </header>
-<main id="chat" class="flex-1 overflow-y-auto no-scrollbar">
-  <div id="messages" class="mx-auto w-full max-w-none px-0 py-4 sm:py-6 space-y-4"></div>
-  <div class="h-24"></div>
-</main>
+<main id="chat" class="flex-1 overflow-y-auto no-scrollbar"><div id="messages" class="mx-auto w-full max-w-none px-0 py-4 sm:py-6 space-y-4"></div><div class="h-24"></div></main>
 <footer class="sticky bottom-0 z-10 bg-gradient-to-t from-white via-white/95 to-white/40 pt-3 pb-[calc(12px+var(--safe-bottom))] border-t border-gray-200">
   <div class="mx-auto w-full max-w-none px-0">
     <form id="composer" class="group relative flex items-end gap-2 px-4">
@@ -120,13 +117,13 @@ function enhanceCodeBlocks(root){root.querySelectorAll('pre>code').forEach(code=
 const md=window.markdownit({html:false,linkify:true,typographer:true,breaks:true});
 function renderMarkdown(node,text){node.innerHTML=md.render(text);enhanceCodeBlocks(node)}
 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){const bubble=msgRow(role);renderMarkdown(bubble,content);state.messages.push({role,content});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=''}
 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=()=>{if(state.controller)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;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]'){finished=true;onDelta('',true);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&&!finished){finished=true;onDelta('',true)}}catch{}}}}if(!finished)onDelta('',true);return {ok:true,text:full}}catch(e){const msg=String(e?.message||e);if(/AbortError/i.test(msg)){onDelta('',true);return {ok:false,text:''}}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}\nSwitching to local demo.\n\n`+localDemoReply(state.messages[state.messages.length-1]?.content||'');onDelta(fallback,true);return {ok:false,text:fallback}}finally{state.controller=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);if(/AbortError/i.test(msg)){onDelta('',true);return {ok:false,text:''}}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}\nSwitching to local demo.\n\n`+localDemoReply(state.messages[state.messages.length-1]?.content||'');onDelta(fallback,true);return {ok:false,text:fallback}}finally{state.controller=null}}
 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')}
@@ -134,8 +131,7 @@ 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 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\">${t.pinned?'📌 ':''}${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()}
@@ -144,11 +140,10 @@ function closeHistory(){el.historyPanel.classList.add('translate-x-full');el.his
 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}
 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();const arr=Array.isArray(th.messages)?[...th.messages]:[];for(const m of arr)addMessage(m.role,m.content);state.messages=[...arr];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.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'))}});
+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()});
-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='';el.input.style.height='auto';addMessage('user',text);state.busy=true;setBtnStop();const assistantBubble=addAssistantBubbleStreaming();let buf='';await askOpenRouterStreaming((delta,done)=>{buf+=delta;renderMarkdown(assistantBubble,buf);if(done){setBtnSend();state.busy=false;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='';el.input.style.height='auto';addMessage('user',text);state.busy=true;setBtnStop();const assistantBubble=addAssistantBubbleStreaming();let buf='',completed=false;await askOpenRouterStreaming((delta,done)=>{buf+=delta;renderMarkdown(assistantBubble,buf);if(done&&!completed){completed=true;setBtnSend();state.busy=false;state.messages.push({role:'assistant',content:buf});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',()=>{el.input.style.height='auto';el.input.style.height=Math.min(el.input.scrollHeight,160)+'px'});
 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')}
@@ -175,7 +170,7 @@ el.assistantsExportOption.addEventListener('click',()=>{const payload={version:1
 el.assistantsImportOption.addEventListener('click',()=>{importMode='assistants';el.importInput.value='';el.importInput.click()});
 el.threadsExportOption.addEventListener('click',async()=>{const all=await idb.all();dl(`threads-${ts()}.json`,{version:1,threads:all});toggleUserMenu(false)});
 el.threadsImportOption.addEventListener('click',()=>{importMode='threads';el.importInput.value='';el.importInput.click()});
-el.importInput.addEventListener('change',async()=>{const file=el.importInput.files?.[0];if(!file)return;try{const text=await file.text();const data=JSON.parse(text);if(importMode==='assistants'){const list=Array.isArray(data)?data:(Array.isArray(data.assistants)?data.assistants:[]);if(!list.length)throw new Error('No assistants');assistants=list.map(a=>({id:a.id||gid(),name:a.name||'Imported',settings:Object.assign({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:''},a.settings||{})}));as.save(assistants);as.setActiveId(data.activeId&&assistants.some(x=>x.id===data.activeId)?data.activeId:assistants[0]?.id||null);renderSidebar();reflectActiveAssistant();state.currentThreadId=null;clearChat();alert('Assistants imported.')}else if(importMode==='threads'){const arr=Array.isArray(data)?data:(Array.isArray(data.threads)?data.threads:[]);if(!arr.length)throw new Error('No threads');for(const t of arr){const id=gid();const th={id,title:titleFrom(t.title||titleFrom(t.messages?.find?.(m=>m.role==='user')?.content||'')),pinned:!!t.pinned,createdAt:t.createdAt||Date.now(),updatedAt:t.updatedAt||Date.now(),messages:Array.isArray(t.messages)?t.messages.filter(m=>m&&m.role&&m.content):[]};await idb.put(th)}await renderHistory();alert('Threads imported.')}toggleUserMenu(false)}catch(err){alert('Import failed')}finally{importMode=null}});
+el.importInput.addEventListener('change',async()=>{const file=el.importInput.files?.[0];if(!file)return;try{const text=await file.text();const data=JSON.parse(text);if(importMode==='assistants'){const list=Array.isArray(data)?data:(Array.isArray(data.assistants)?data.assistants:[]);if(!list.length)throw new Error('No assistants');assistants=list.map(a=>({id:a.id||gid(),name:a.name||'Imported',settings:Object.assign({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:''},a.settings||{})}));as.save(assistants);as.setActiveId(data.activeId&&assistants.some(x=>x.id===data.activeId)?data.activeId:assistants[0]?.id||null);renderSidebar();reflectActiveAssistant();state.currentThreadId=null;clearChat();alert('Assistants imported.')}else if(importMode==='threads'){const arr=Array.isArray(data)?data:(Array.isArray(data.threads)?data.threads:[]);if(!arr.length)throw new Error('No threads');for(const t of arr){const th={id:gid(),title:titleFrom(t.title||titleFrom(t.messages?.find?.(m=>m.role==='user')?.content||'')),pinned:!!t.pinned,createdAt:t.createdAt||Date.now(),updatedAt:t.updatedAt||Date.now(),messages:Array.isArray(t.messages)?t.messages.filter(m=>m&&m.role&&m.content):[]};await idb.put(th)}await renderHistory();alert('Threads imported.')}toggleUserMenu(false)}catch{alert('Import failed')}finally{importMode=null}});
 async function init(){await idb.open();await renderHistory();renderSidebar();reflectActiveAssistant();clearChat();if(window.lucide)lucide.createIcons()}
 window.addEventListener('resize',()=>hideHistoryMenu());
 init()