diff --git a/internal/httpapi/static/app.css b/internal/httpapi/static/app.css
index 775654f..d1daaed 100644
--- a/internal/httpapi/static/app.css
+++ b/internal/httpapi/static/app.css
@@ -1,5 +1,5 @@
 html, body { height: 100%; }
-body { padding: 0; display: grid; grid-template-rows: auto 1fr auto; min-height: 100vh; overflow: hidden; }
+body { padding: 0; display: grid; grid-template-rows: auto 1fr auto; min-height: 100vh; }
 header.nav { position: sticky; top: 0; z-index: 10; padding: .6rem 1rem; border-bottom: 1px solid var(--muted-border-color); display: flex; justify-content: space-between; align-items: center; background: var(--background-color); }
 header.nav a.brand { text-decoration: none; font-weight: 600; }
 /* Dashboard-only grid layout */
@@ -8,7 +8,7 @@ header.nav a.brand { text-decoration: none; font-weight: 600; }
 .dash aside.sidebar a { display:block; padding:.25rem .5rem; border-radius:.25rem; text-decoration:none; }
 .dash aside.sidebar a.active { background: var(--muted-color); color: var(--contrast); }
 .dash section.chat { padding: .75rem 1rem; display:flex; flex-direction: column; height: 100%; min-height: 0; }
-#tail { flex: 1; overflow: auto; white-space: pre-wrap; word-break: break-word; overflow-wrap: anywhere; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; height: 100%; }
+#tail { flex: 1; overflow: visible; white-space: pre-wrap; word-break: break-word; overflow-wrap: anywhere; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; height: auto; }
 .ts { opacity: .66; }
 .msg { margin-bottom: .25rem; }
 footer { text-align: center; font-size: .85rem; padding: .5rem 0; opacity: .7; background: var(--background-color); }
diff --git a/internal/httpapi/static/app.js b/internal/httpapi/static/app.js
index 77a1b59..490f020 100644
--- a/internal/httpapi/static/app.js
+++ b/internal/httpapi/static/app.js
@@ -16,8 +16,8 @@ async function api(path, params){
   return res.text();
 }
 
-function appendBatch(arr){ const el=document.getElementById('tail'); const frag=document.createDocumentFragment(); arr.forEach(m=>{ const div=document.createElement('div'); div.className='msg'; div.innerHTML=lineHTML(m); frag.appendChild(div); processLinks(div); }); el.appendChild(frag); if(st.atBottom){ el.scrollTop = el.scrollHeight; } }
-function prependBatch(arr){ const el=document.getElementById('tail'); const oldTop=el.firstChild; const frag=document.createDocumentFragment(); arr.forEach(m=>{ const div=document.createElement('div'); div.className='msg'; div.innerHTML=lineHTML(m); frag.appendChild(div); processLinks(div); }); el.insertBefore(frag, el.firstChild); if(oldTop){ oldTop.scrollIntoView(); } }
+function appendBatch(arr){ const el=document.getElementById('tail'); const frag=document.createDocumentFragment(); arr.forEach(m=>{ const div=document.createElement('div'); div.className='msg'; div.innerHTML=lineHTML(m); frag.appendChild(div); processLinks(div); }); el.appendChild(frag); if(st.atBottom){ window.scrollTo({top: document.body.scrollHeight, behavior: 'instant'}); } }
+function prependBatch(arr){ const el=document.getElementById('tail'); const oldTop=el.firstChild; const prevPageOffset = window.pageYOffset; const frag=document.createDocumentFragment(); arr.forEach(m=>{ const div=document.createElement('div'); div.className='msg'; div.innerHTML=lineHTML(m); frag.appendChild(div); processLinks(div); }); el.insertBefore(frag, el.firstChild); if(oldTop){ oldTop.scrollIntoView(); window.scrollTo({top: oldTop.getBoundingClientRect().top + window.pageYOffset - 80, behavior: 'instant'}); } else { window.scrollTo({top: prevPageOffset, behavior: 'instant'}); } }
 
 function processLinks(scope){ const links = scope.querySelectorAll('a[href]:not([data-card])'); links.forEach(a=>{ a.setAttribute('data-card','1');
   // Fetch and render card
@@ -55,7 +55,7 @@ async function loadChannels(){ try{ const data = await api('/api/channels'); st.
 function renderChannels(){ const list=document.getElementById('chanlist'); if(!list) return; list.innerHTML=''; st.channels.forEach(c=>{ const a=document.createElement('a'); a.href='#'; a.textContent=c; a.onclick=(ev)=>{ev.preventDefault(); selectChannel(c)}; if(c===st.current) a.className='active'; list.appendChild(a); }); }
 
 async function selectChannel(ch){ if(st.sse){ st.sse.close(); st.sse=null; } st.current=ch; renderChannels(); const el=document.getElementById('tail'); if(!el) return; el.textContent=''; const data = await api('/api/tail',{query:{channel:ch,limit:50}}); appendBatch(data); el.scrollTop = el.scrollHeight; st.atBottom=true; st.earliest = data.length? data[0].time : null; startStream(); initScrollHandlers(); }
-function initScrollHandlers(){ const el=document.getElementById('tail'); if(!el) return; el.onscroll=async ()=>{ st.atBottom = (el.scrollTop + el.clientHeight + 8) >= el.scrollHeight; if(el.scrollTop === 0 && st.earliest){ try{ const older = await api('/api/history',{query:{channel:st.current,before:st.earliest,limit:50}}); if(older.length){ const hBefore = el.scrollHeight; prependBatch(older); st.earliest = older[0].time; const hAfter = el.scrollHeight; el.scrollTop = hAfter - hBefore; } } catch(e){} } } }
+function initScrollHandlers(){ const el=document.getElementById('tail'); if(!el) return; const onScroll = async ()=>{ const nearBottom = (window.innerHeight + window.pageYOffset + 16) >= document.body.offsetHeight; st.atBottom = nearBottom; if(window.pageYOffset === 0 && st.earliest){ try{ const older = await api('/api/history',{query:{channel:st.current,before:st.earliest,limit:50}}); if(older.length){ prependBatch(older); st.earliest = older[0].time; } } catch(e){} } }; window.removeEventListener('scroll', st._scrollHandler || (()=>{})); st._scrollHandler = onScroll; window.addEventListener('scroll', onScroll, {passive:true}); }
 
 function startStream(){ const el=document.getElementById('tail'); if(!el) return; const url=new URL('/api/stream', window.location.origin); url.searchParams.set('channel', st.current); const es=new EventSource(url); st.sse=es; es.onmessage=(ev)=>{ try{ const m=JSON.parse(ev.data); appendBatch([m]); }catch(e){} }; es.onerror=()=>{ es.close(); st.sse=null; setTimeout(startStream, 3000); } }