Fix #14 (edit leaves a draft) and #8 (last-seen flapping)

#14: after editing a message the edited text reappeared in the composer as a
draft and re-sent as a new message. The input listener saved a draft while
editing, but saveEdit/cancelEdit cleared only the input value, not the stored
draft — so openConvo restored it. Now editing never writes a draft, and
save/cancel clear it.

#8: a contact's subtitle flapped between "last seen …" and "Offline". A
loadSidebar rebuild replaced the row with the server's lastSeen, which is
sometimes null (the disconnect touchSeen is fire-and-forget and can lag the
presence broadcast). Now the client keeps last-seen sticky (never overwrites a
known value with null) and the server never broadcasts a null last-seen for an
offline user.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

server/public/home.html

@@ -1604,6 +1604,7 @@ function openStorage(){
 let ME={};
 let CONTACTS=[];           // team users (for new DMs / picking group members)
 let ROWS=[];               // sidebar items: {kind:'dm'|'group', id, name, online?, members?, last_body, last_at, last_from_me, unread}
+const _lastSeen={};        // #8: userId -> last-seen ts, kept STICKY so a rebuild/presence event that lacks it can't flap the label back to "Offline"
 let selected=null;         // {kind,id} or null = welcome
 let convoIsGroup=false;    // the open thread is a group (drives per-message sender labels)
 let THREAD=[];
@@ -2032,6 +2033,10 @@ async function loadSidebar(){
   const selfRow=items.find(i=>i.kind==='dm' && i.id===(ME&&ME.id));
   if(selfRow){ selfRow.self=true; selfRow.name='You'; selfRow.avatar=ME.avatarUrl||selfRow.avatar||null; }
   else if(ME&&ME.id){ items.push({ kind:'dm', id:ME.id, name:'You', self:true, avatar:ME.avatarUrl||null, online:false, last_body:'', last_at:0, last_from_me:false, unread:0 }); }
+  // #8: keep last-seen sticky. The server occasionally returns null (a presence broadcast can race ahead of
+  // the last_seen DB write), which used to flip the subtitle from "last seen …" to "Offline". Remember any
+  // known value and backfill nulls from it so the label stays stable.
+  items.forEach(it=>{ if(it.kind==='dm'&&!it.self){ if(it.lastSeen) _lastSeen[it.id]=it.lastSeen; else if(_lastSeen[it.id]) it.lastSeen=_lastSeen[it.id]; } });
   ROWS=items;
   renderChats(searchVal());
   updateRailUnread();
@@ -2291,13 +2296,14 @@ function startEdit(m){
   const bar=document.getElementById('replyBar'); if(bar){ bar.innerHTML='<span>'+ic('edit',13)+' Editing message</span><span class="rx" id="editCancel">'+ic('x',15)+'</span>'; bar.style.display='flex'; const x=document.getElementById('editCancel'); if(x) x.onclick=cancelEdit; }
   const inp=document.getElementById('msgInput'); if(inp){ inp.value=m.body||''; autoGrow(inp); inp.focus(); }
 }
-function cancelEdit(){ editTarget=null; const bar=document.getElementById('replyBar'); if(bar){ bar.style.display='none'; bar.innerHTML=''; } const inp=document.getElementById('msgInput'); if(inp){ inp.value=''; autoGrow(inp); } }
+function cancelEdit(){ editTarget=null; const bar=document.getElementById('replyBar'); if(bar){ bar.style.display='none'; bar.innerHTML=''; } const inp=document.getElementById('msgInput'); if(inp){ inp.value=''; autoGrow(inp); } try{ if(selected) setDraft(selected.kind, selected.id, ''); }catch(_){} } // #14: clear the draft too
 async function saveEdit(text){
   const m=editTarget; if(!m) return;
   if(!text){ cancelEdit(); return; } // empty → treat as cancel (delete is a separate action)
   if(text===(m.body||'')){ cancelEdit(); return; } // no change
   editTarget=null; const bar=document.getElementById('replyBar'); if(bar){ bar.style.display='none'; bar.innerHTML=''; }
   const inp=document.getElementById('msgInput'); if(inp){ inp.value=''; autoGrow(inp); }
+  try{ if(selected) setDraft(selected.kind, selected.id, ''); }catch(_){} // #14: clear the draft, else the edited text reappears and re-sends as a NEW message
   try{
     await postJSON('/api/messages/edit',{ id:m.id, body:text });
     const t=THREAD.find(x=>x.id===m.id); if(t){ t.body=text; t.edited_at=Date.now(); updateBubble(t); }
@@ -2636,7 +2642,7 @@ async function startOrJoinDmCall(otherId){
 function onPresence(d){
   if(!d||!d.userId) return;
   const it=rowFor('dm', d.userId);
-  if(it){ it.online=!!d.online; it.status=d.status||'active'; if(d.lastSeen) it.lastSeen=d.lastSeen; renderChats(searchVal()); } // #2: keep last-seen fresh
+  if(it){ it.online=!!d.online; it.status=d.status||'active'; if(d.lastSeen){ it.lastSeen=d.lastSeen; _lastSeen[d.userId]=d.lastSeen; } renderChats(searchVal()); } // #2/#8: keep last-seen fresh + sticky
   if(selected && selected.kind==='dm' && selected.id===d.userId && it){
     const sub=document.querySelector('#convoTitle .st'); if(sub) sub.textContent=dmSubLabel(it);
     const dot=document.querySelector('.convo-head .avatar .dot'); if(dot) dot.className='dot '+statusCls(it);
@@ -3296,7 +3302,7 @@ async function openConvo(kind,id){
   if(inpEl){
     const _d=getDraft(kind,id); if(_d){ inpEl.value=_d; autoGrow(inpEl); } // restore unsent draft
     inpEl.addEventListener('paste', onPaste);
-    inpEl.addEventListener('input', ()=>{ maybeAutocorrect(inpEl); autoGrow(inpEl); setDraft(kind,id,inpEl.value); noteTyping(); }); // auto-correct common typos, keep the draft in sync + emit "typing…"
+    inpEl.addEventListener('input', ()=>{ maybeAutocorrect(inpEl); autoGrow(inpEl); if(!editTarget) setDraft(kind,id,inpEl.value); noteTyping(); }); // auto-correct common typos, keep the draft in sync (#14: not while editing) + emit "typing…"
     inpEl.addEventListener('blur', ()=>{ stopTyping(); setTimeout(()=>{ const a=document.activeElement; const stillTyping=a&&(a.tagName==='TEXTAREA'||a.tagName==='INPUT'); if(!stillTyping && window.__bzResetKb) window.__bzResetKb(); }, 120); }); // #1: composer lost focus → keyboard is closing → drop the --kb lift so no empty gap remains
     inpEl.addEventListener('keydown', (e)=>{ if(e.key==='Enter' && !e.shiftKey && !isMobileUA()){ if(mentionItems && mentionItems.length) return; e.preventDefault(); sendMessage(); } }); // Desktop: Enter sends, Shift+Enter = newline. Mobile: the Return key inserts a newline (default) — you send with the send button, like every native chat app.
     // Desktop: LEFT-click a red-squiggled word → native spelling suggestions right there (the shell