fix: make Analysis tab robust when no snapshot data exists

- showView() now tracks _curView, scrolls to top, forces visibility
- loadAnalysis() shows clear "No data yet" message when API returns null
  instead of silently leaving static placeholder text
- forceRefreshAnalysis() added: POSTs /api/refresh then reloads analysis
- ↻ Refresh button added at top of Analysis view with live timestamp
- Auto-refresh analysis every 30s when Analysis tab is active

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

public/index.html

@@ -302,6 +302,10 @@
 </div>
 </div><!-- end view-dashboard -->
 <div data-view="analysis" id="view-analysis" style="display:none">
+<div style="display:flex;align-items:center;justify-content:space-between;margin-bottom:14px">
+  <span style="font-size:.7rem;color:var(--text3)" id="a-asof-top"></span>
+  <button class="ibtn" id="a-refresh-btn" onclick="forceRefreshAnalysis()" style="font-size:.72rem;padding:5px 12px;border-radius:9px;border:1px solid var(--border2)">&#8635; Refresh</button>
+</div>
 <div style="display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:16px" class="a-sum-grid">
   <div class="card pcard pu"><div class="plbl">Net Delta</div><div class="pval fl" id="a-delta">&#8212;</div><div class="psub">Directional exposure</div></div>
   <div class="card pcard" style="--ca:#F5A623;--cb:#E67E22"><div class="plbl">Net Theta / day</div><div class="pval fl" id="a-theta">&#8212;</div><div class="psub">Daily time decay (&#8377;)</div></div>
@@ -818,21 +822,46 @@ function setExpiry(btn,exp){
 var _CAT_COLOR={DANGER_SHORT:'#E74C3C',DEAD_WEIGHT:'#F5A623',UNDER_PRESSURE:'#E67E22',HEDGE:'#3498DB',WORKING:'#2ECC71'};
 var _CAT_EMOJI={DANGER_SHORT:'🔴',DEAD_WEIGHT:'🟡',UNDER_PRESSURE:'🟠',HEDGE:'🔵',WORKING:'🟢'};
 var _RISK_COL={LOW:'var(--green)',MODERATE:'var(--amber)',HIGH:'#E67E22',CRITICAL:'var(--red)'};
+var _curView='dashboard';
 
 function showView(name){
+  _curView=name;
   document.querySelectorAll('[data-view]').forEach(function(el){el.style.display='none';});
-  var el=document.getElementById('view-'+name);if(el)el.style.display='block';
+  var el=document.getElementById('view-'+name);
+  if(el){el.style.display='block';el.style.visibility='visible';}
   document.querySelectorAll('.nav-tab').forEach(function(t){t.classList.remove('active');});
   var tab=document.querySelector('.nav-tab[data-target="'+name+'"]');if(tab)tab.classList.add('active');
+  window.scrollTo(0,0);
   if(name==='analysis')loadAnalysis();
 }
 
+async function forceRefreshAnalysis(){
+  var btn=document.getElementById('a-refresh-btn');
+  if(btn){btn.textContent='Refreshing…';btn.disabled=true;}
+  try{
+    await fetch('/api/refresh',{method:'POST'});
+  }catch(e){}
+  await loadAnalysis();
+  if(btn){btn.textContent='↻ Refresh';btn.disabled=false;}
+}
+
 async function loadAnalysis(){
+  var tbody=document.getElementById('a-class-body');
+  var rBody=document.getElementById('a-risk-body');
+  var sBody=document.getElementById('a-scen-body');
   try{
     var res=await fetch('/api/analysis').then(function(r){return r.json();});
-    if(!res.ok||!res.data)return;
+    if(!res||!res.ok||!res.data){
+      if(tbody)tbody.innerHTML='<tr><td colspan="8" style="text-align:center;padding:36px;color:var(--text3)">No analysis data yet — click ↻ Refresh above to trigger a poll</td></tr>';
+      if(rBody)rBody.innerHTML='<div style="color:var(--text3);font-size:.8rem;padding:14px 20px">No data yet</div>';
+      if(sBody)sBody.innerHTML='<div style="color:var(--text3);font-size:.8rem;padding:14px 20px">No data yet</div>';
+      return;
+    }
     renderAnalysis(res.data,res.asOf);
-  }catch(e){console.error('loadAnalysis:',e);}
+  }catch(e){
+    console.error('loadAnalysis:',e);
+    if(tbody)tbody.innerHTML='<tr><td colspan="8" style="text-align:center;padding:36px;color:var(--red)">Error: '+(e&&e.message?e.message:String(e))+'</td></tr>';
+  }
 }
 
 function renderAnalysis(d,asOf){
@@ -932,13 +961,15 @@ function renderAnalysis(d,asOf){
             return '<td class="mono" style="color:'+c+';font-weight:600">'+(pt.totalPnl>=0?'+':'')+'₹'+Math.round(pt.totalPnl).toLocaleString('en-IN')+'</td>';}).join('')+
           '</tr></tbody></table></div></div>';}).join('');}}
 
-  var asofEl=document.getElementById('a-asof');
+  var asofStr=asOf?'Updated: '+toIST(asOf):'';
-  if(asofEl&&asOf)asofEl.textContent='Updated: '+toIST(asOf);
+  var asofEl=document.getElementById('a-asof');if(asofEl)asofEl.textContent=asofStr;
+  var asofTop=document.getElementById('a-asof-top');if(asofTop)asofTop.textContent=asofStr;
 }
 /* ── End Analysis Tab ─────────────────────────────────────────────────── */
 loadConfig();refresh();
 setInterval(refresh,60000);
 setInterval(loadMarket,15000);
+setInterval(function(){if(_curView==='analysis')loadAnalysis();},30000);
 </script>
 </body>
 </html>