diff --git a/index.html b/index.html
index 597de5f..bb87d54 100644
--- a/index.html
+++ b/index.html
@@ -65,6 +65,7 @@
 <div id="threadPopover" class="menu-card hidden">
   <button data-action="pin" class="menu-item"><i data-lucide="pin" class="h-4 w-4"></i><span>Pin to top</span></button>
   <button data-action="rename" class="menu-item"><i data-lucide="edit-3" class="h-4 w-4"></i><span>Rename</span></button>
+  <button data-action="export" class="menu-item"><i data-lucide="download" class="h-4 w-4"></i><span>Export</span></button>
   <button data-action="delete" class="menu-item text-red-600"><i data-lucide="trash-2" class="h-4 w-4"></i><span>Delete</span></button>
   <button data-action="count_tokens" class="menu-item"><i data-lucide="hash" class="h-4 w-4"></i><span>Count tokens (approx.)</span></button>
 </div>
@@ -153,6 +154,7 @@
 <script src="https://cdn.jsdelivr.net/npm/markdown-it@14.1.0/dist/markdown-it.min.js"></script>
 <script src="https://cdn.jsdelivr.net/gh/highlightjs/cdn-release@11.9.0/build/highlight.min.js"></script>
 <script src="https://cdn.jsdelivr.net/npm/localforage@1.10.0/dist/localforage.min.js"></script>
+<script src="https://cdn.jsdelivr.net/npm/json-stream-parser@0.0.2/index.min.js"></script>
 <script>
 document.addEventListener('DOMContentLoaded',()=>{
 const DEFAULT_MODEL='google/gemini-2.5-pro',DEFAULT_API_KEY=''
@@ -223,7 +225,7 @@ $(el.threadList).on('scroll',()=>{
   }
   isAddingThreads=false;
 });
-$(el.threadPopover).on('click',async e=>{const act=e.target.closest('[data-action]')?.getAttribute('data-action');if(!act||!menuThreadId)return;const th=THREAD.get(menuThreadId);if(!th)return;if(act==='pin'){th.pinned=!th.pinned}else if(act==='rename'){const nv=prompt('Rename to:',th.title);if(nv!=null){th.title=titleFrom(nv);th.updatedAt=Date.now()}}else if(act==='delete'){if(confirm('Delete this chat?')){THREAD.list=THREAD.list.filter(x=>x.id!==th.id);if(state.currentThreadId===th.id){state.currentThreadId=null;clearChat()}}}else if(act==='count_tokens'){const msgs=Array.isArray(th.messages)?th.messages:[];let totalChars=0;for(const m of msgs){if(!m||!m.role||m.role==='system')continue;totalChars+=String(partsToText(m.content||'')||'').length}const tokens=Math.max(0,Math.ceil(totalChars/4));const k=tokens>=1000?Math.round(tokens/1000)+'k':String(tokens);alert(tokens+' tokens ('+k+')')}hideThreadPopover();await THREAD.save();renderThreads()})
+$(el.threadPopover).on('click',async e=>{const act=e.target.closest('[data-action]')?.getAttribute('data-action');if(!act||!menuThreadId)return;const th=THREAD.get(menuThreadId);if(!th)return;if(act==='pin'){th.pinned=!th.pinned}else if(act==='rename'){const nv=prompt('Rename to:',th.title);if(nv!=null){th.title=titleFrom(nv);th.updatedAt=Date.now()}}else if(act==='export'){const safeTitle=(th.title||'untitled').replace(/\W/g,'_').slice(0,30);dl(`thread-${safeTitle}-${ts()}.json`,{version:1,threads:[th]})}else if(act==='delete'){if(confirm('Delete this chat?')){THREAD.list=THREAD.list.filter(x=>x.id!==th.id);if(state.currentThreadId===th.id){state.currentThreadId=null;clearChat()}}}else if(act==='count_tokens'){const msgs=Array.isArray(th.messages)?th.messages:[];let totalChars=0;for(const m of msgs){if(!m||!m.role||m.role==='system')continue;totalChars+=String(partsToText(m.content||'')||'').length}const tokens=Math.max(0,Math.ceil(totalChars/4));const k=tokens>=1000?Math.round(tokens/1000)+'k':String(tokens);alert(tokens+' tokens ('+k+')')}hideThreadPopover();await THREAD.save();renderThreads()})
 $(el.suneList).on('click',async e=>{const menuBtn=e.target.closest('[data-sune-menu]');if(menuBtn){e.stopPropagation();showSunePopover(menuBtn,menuBtn.getAttribute('[data-sune-menu]')?menuBtn.getAttribute('[data-sune-menu]'):menuBtn.getAttribute('data-sune-menu'));return}const btn=e.target.closest('[data-sune-id]');if(!btn)return;const id=btn.getAttribute('data-sune-id');if(id){if(state.busy){state.controller?.disconnect?.();setBtnSend();state.busy=false;state.controller=null};SUNE.setActive(id);renderSidebar();await reflectActiveSune();state.currentThreadId=null;clearChat();document.getElementById('sidebarLeft').classList.add('-translate-x-full');document.getElementById('sidebarOverlayLeft').classList.add('hidden')}})
 $(el.sunePopover).on('click',async e=>{const act=e.target.closest('[data-action]')?.getAttribute('data-action');if(!act||!menuSuneId)return;const s=SUNE.get(menuSuneId);if(!s)return;const updateAndRender=async()=>{s.updatedAt=Date.now();SUNE.save();renderSidebar();await reflectActiveSune()};if(act==='pin'){s.pinned=!s.pinned;await updateAndRender()}else if(act==='rename'){const n=prompt('Rename sune to:',s.name);if(n!=null){s.name=n.trim();await updateAndRender()}}else if(act==='pfp'){const i=document.createElement('input');i.type='file';i.accept='image/*';i.onchange=async()=>{const f=i.files?.[0];if(!f)return;try{s.avatar=await imgToWebp(f);await updateAndRender()}catch{}};i.click()}else if(act==='export')dl(`sune-${(s.name||'sune').replace(/\W/g,'_')}-${ts()}.sune`,[s]);hideSunePopover()})
 function updateAttachBadge(){const n=state.attachments.length;el.attachBadge.textContent=String(n);el.attachBadge.classList.toggle('hidden',n===0)}
@@ -253,7 +255,7 @@ $(el.sunesExportOption).on('click',()=>{dl(`sunes-${ts()}.sune`,{version:1,sunes
 $(el.sunesImportOption).on('click',()=>{importMode='sunes';el.importInput.value='';el.importInput.click()})
 $(el.threadsExportOption).on('click',()=>{dl(`threads-${ts()}.json`,{version:1,threads:THREAD.list});el.userMenu.classList.add('hidden')})
 $(el.threadsImportOption).on('click',()=>{importMode='threads';el.importInput.value='';el.importInput.click()})
-$(el.importInput).on('change',async()=>{const file=el.importInput.files?.[0];if(!file)return;try{const text=await file.text();const data=JSON.parse(text);if(importMode==='sunes'){const list=Array.isArray(data)?data:(Array.isArray(data.sunes)?data.sunes:[]);if(!list.length)throw new Error('No sunes');const incoming=list.map(a=>makeSune(a||{}));const map={};incoming.forEach(s=>{if(!s.id)s.id=gid();const k=s.id,prev=map[k];map[k]=!prev||(+s.updatedAt>+prev.updatedAt)?s:prev});let added=0,updated=0;const idx=Object.fromEntries(sunes.map(s=>[s.id,s]));Object.values(map).forEach(s=>{const ex=idx[s.id];if(!ex){sunes.push(s);added++}else if(+s.updatedAt>+ex.updatedAt){Object.assign(ex,s);updated++}});SUNE.save();if(data.activeId&&sunes.some(x=>x.id===data.activeId))SUNE.setActive(data.activeId);renderSidebar();await reflectActiveSune();state.currentThreadId=null;clearChat();alert(`${added} new, ${updated} updated.`)}else if(importMode==='threads'){const arr=Array.isArray(data)?data:(Array.isArray(data.threads)?data.threads:[]);if(!arr.length)throw new Error('No threads');const norm=t=>({id:t.id||gid(),title:titleFrom(t.title||titleFrom(t.messages?.find?.(m=>m.role==='user')?.content||'')),pinned:!!t.pinned,updatedAt:t.updatedAt||Date.now(),messages:Array.isArray(t.messages)?t.messages.filter(m=>m&&m.role&&m.content):[]});const best={};arr.forEach(t=>{const n=norm(t),k=n.id,prev=best[k];best[k]=!prev||(+n.updatedAt>+prev.updatedAt)?n:prev});let kept=0,skipped=0;const idx=Object.fromEntries(THREAD.list.map(t=>[t.id,t]));for(const th of Object.values(best)){const ex=idx[th.id];if(ex&&+ex.updatedAt>=+th.updatedAt){skipped++;continue}if(!ex)THREAD.list.push(th);else Object.assign(ex,th);kept++}await THREAD.save();await renderThreads();alert(`${kept} imported, ${skipped} skipped (older).`)}el.userMenu.classList.add('hidden')}catch{alert('Import failed')}finally{importMode=null}})
+$(el.importInput).on('change',async()=>{const file=el.importInput.files?.[0];if(!file)return;try{if(importMode==='threads'&&window.JSONParser&&file.size>5*1024*1024){alert('Streaming large import...');let p=0;const b={},n=t=>({id:t.id||gid(),title:titleFrom(t.title||titleFrom(t.messages?.find?.(m=>m.role==='user')?.content||'')),pinned:!!t.pinned,updatedAt:t.updatedAt||Date.now(),messages:Array.isArray(t.messages)?t.messages.filter(m=>m&&m.role&&m.content):[]});const parser=new JSONParser();parser.onValue=({value,stack})=>{if(typeof value!=='object'||value===null||Array.isArray(value))return;if(!stack.length||!Array.isArray(stack[stack.length-1].value))return;const isRoot=stack.length===1,isThreads=stack.length===2&&stack[0].key==='threads';if(isRoot||isThreads){const v=n(value);const k=v.id,prev=b[k];b[k]=!prev||(+v.updatedAt>+prev.updatedAt)?v:v;p++}};const reader=file.stream().pipeThrough(new TextDecoderStream()).getReader();(async()=>{try{while(true){const{value,done}=await reader.read();if(done)break;parser.write(value)}if(p===0)throw new Error('No threads parsed.');let kept=0,skipped=0;const idx=Object.fromEntries(THREAD.list.map(t=>[t.id,t]));for(const th of Object.values(b)){const ex=idx[th.id];if(ex&&+ex.updatedAt>=+th.updatedAt){skipped++;continue}if(!ex)THREAD.list.push(th);else Object.assign(ex,th);kept++}await THREAD.save();await renderThreads();alert(`${kept} imported, ${skipped} skipped (older).`);el.userMenu.classList.add('hidden')}catch(e){alert('Import failed. '+e.message)}finally{importMode=null}})();return}const text=await file.text();const data=JSON.parse(text);if(importMode==='sunes'){const list=Array.isArray(data)?data:(Array.isArray(data.sunes)?data.sunes:[]);if(!list.length)throw new Error('No sunes');const incoming=list.map(a=>makeSune(a||{}));const map={};incoming.forEach(s=>{if(!s.id)s.id=gid();const k=s.id,prev=map[k];map[k]=!prev||(+s.updatedAt>+prev.updatedAt)?s:prev});let added=0,updated=0;const idx=Object.fromEntries(sunes.map(s=>[s.id,s]));Object.values(map).forEach(s=>{const ex=idx[s.id];if(!ex){sunes.push(s);added++}else if(+s.updatedAt>+ex.updatedAt){Object.assign(ex,s);updated++}});SUNE.save();if(data.activeId&&sunes.some(x=>x.id===data.activeId))SUNE.setActive(data.activeId);renderSidebar();await reflectActiveSune();state.currentThreadId=null;clearChat();alert(`${added} new, ${updated} updated.`)}else if(importMode==='threads'){const arr=Array.isArray(data)?data:(Array.isArray(data.threads)?data.threads:[]);if(!arr.length)throw new Error('No threads');const norm=t=>({id:t.id||gid(),title:titleFrom(t.title||titleFrom(t.messages?.find?.(m=>m.role==='user')?.content||'')),pinned:!!t.pinned,updatedAt:t.updatedAt||Date.now(),messages:Array.isArray(t.messages)?t.messages.filter(m=>m&&m.role&&m.content):[]});const best={};arr.forEach(t=>{const n=norm(t),k=n.id,prev=best[k];best[k]=!prev||(+n.updatedAt>+prev.updatedAt)?n:prev});let kept=0,skipped=0;const idx=Object.fromEntries(THREAD.list.map(t=>[t.id,t]));for(const th of Object.values(best)){const ex=idx[th.id];if(ex&&+ex.updatedAt>=+th.updatedAt){skipped++;continue}if(!ex)THREAD.list.push(th);else Object.assign(ex,th);kept++}await THREAD.save();await renderThreads();alert(`${kept} imported, ${skipped} skipped (older).`)}el.userMenu.classList.add('hidden')}catch{alert('Import failed')}finally{importMode=null}})
 function kbUpdate(){const vv=window.visualViewport;const overlap=vv?Math.max(0,(window.innerHeight-(vv.height+vv.offsetTop))):0;document.documentElement.style.setProperty('--kb',overlap+'px');const fh=el.footer.getBoundingClientRect().height;document.documentElement.style.setProperty('--footer-h',fh+'px');el.footer.style.transform='translateY('+(-overlap)+'px)';el.chat.style.scrollPaddingBottom=(fh+overlap+16)+'px'}
 function kbBind(){if(window.visualViewport){['resize','scroll'].forEach(ev=>visualViewport.addEventListener(ev,()=>kbUpdate(),{passive:true}))}$(window).on('resize orientationchange',()=>setTimeout(kbUpdate,50));$(el.input).on('focus click',()=>{setTimeout(()=>{kbUpdate();el.input.scrollIntoView({block:'nearest',behavior:'smooth'})},0)})}
 function activeMeta(){return {sune_name:SUNE.name,model:SUNE.model,avatar:SUNE.avatar}}