Give cold visitors context on member dashboards

/my/<id> links circulate (address-bar shares, pre-/join links), and a
cold prospect landing there saw stats with no story. First-time viewers
of a position now get a banner: two-sentence RM Circle summary, a
"Read your invitation from this member" CTA into /join/<id>, a strategy
link, and the risk line. Hidden for repeat viewers of the same position
(likely the member) and dismissible per session.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

public/my.js

@@ -58,6 +58,17 @@
   });
   function render(d){
     prompt.classList.add('hidden');dash.classList.remove('hidden');
+    // cold-visitor context banner: shown unless this looks like the member's own
+    // dashboard (their stored ID matches) or they dismissed it this session
+    try{
+      const intro=document.getElementById('coldIntro');
+      const seenBefore=d._priorId===String(d.id); // they've viewed this position before (likely their own)
+      const dismissed=sessionStorage.getItem('ctb.introDismissed')==='1';
+      if(intro){
+        if(!seenBefore&&!dismissed){intro.classList.remove('hidden');document.getElementById('coldIntroJoin').href='/join/'+d.id;}
+        else intro.classList.add('hidden');
+      }
+    }catch(e){}
     document.getElementById('dTitle').textContent='#'+d.id;
     const qb=document.getElementById('dQualified');
     if(qb)qb.outerHTML=d.directCount>=2
@@ -128,7 +139,7 @@
       const d=await r.json();
       if(!r.ok)throw new Error(d.error||'Lookup failed');
       if(!d.registered)throw new Error(`ID ${id} isn't registered on the smart contract — double-check the number.`);
-      try{localStorage.setItem('ctb.myId',String(id))}catch(e){}
+      try{d._priorId=localStorage.getItem('ctb.myId');localStorage.setItem('ctb.myId',String(id))}catch(e){}
       if(!/^\/my\/\d+$/.test(location.pathname))history.replaceState(null,'','/my/'+id);
       render(d);
     }catch(x){
@@ -136,6 +147,8 @@
       document.getElementById('idError').textContent=x.message;
     }
   }
+  const introX=document.getElementById('coldIntroClose');
+  if(introX)introX.addEventListener('click',()=>{try{sessionStorage.setItem('ctb.introDismissed','1')}catch(e){};document.getElementById('coldIntro').classList.add('hidden')});
   document.getElementById('dJoinForm').addEventListener('submit',async e=>{
     e.preventDefault();
     const form=e.currentTarget,msg=document.getElementById('dJoinMsg');