feat(dashboard): "App installs" view + compact top-right Download button

- dashboard.html: admin "App installs" card — table of user · platform · version · OS ·
  first/last seen, from GET /api/v1/admin/installs (loadInstalls).
- index.html: replaced the long inline link with a compact white "Download app" button in
  the blue top header (top-right); hidden when already inside the desktop app.

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

server/public/dashboard.html

@@ -235,6 +235,11 @@ async function dashboard(me) {
         <button id="hAdd">Add webhook</button>
       </div>
       <div id="hOut"></div>
+    </div>
+    <div class="card" id="installsCard">
+      <h2>App installs <span class="muted" style="font-weight:400;font-size:.8rem;text-transform:none;letter-spacing:0">— who installed the desktop / mobile app</span></h2>
+      <div class="table-scroll"><table id="installs"><thead><tr><th>User</th><th>Platform</th><th>Version</th><th>OS</th><th>First seen</th><th>Last seen</th></tr></thead><tbody></tbody></table></div>
+      <p id="installsEmpty" class="muted" style="margin-top:.6rem;display:none">No installs recorded yet.</p>
     </div>` : ''}`);
   document.getElementById('fApply').onclick = loadReport;
   document.getElementById('fExcel').onclick = exportExcel;
@@ -246,8 +251,17 @@ async function dashboard(me) {
     document.getElementById('hAdd').onclick = createHook;
     await loadKeys();
     await loadHooks();
+    await loadInstalls();
   }
 }
+async function loadInstalls(){
+  let rows=[]; try{ rows=await fetch('/api/v1/admin/installs').then(r=>r.json()); }catch(_){}
+  const tb=document.querySelector('#installs tbody'); if(!tb) return;
+  const empty=document.getElementById('installsEmpty');
+  if(!Array.isArray(rows)||!rows.length){ tb.innerHTML=''; if(empty) empty.style.display='block'; return; }
+  if(empty) empty.style.display='none';
+  tb.innerHTML=rows.map(r=>`<tr><td>${esc(r.user_email||'—')}</td><td>${esc(r.platform||'—')}</td><td>${esc(r.app_version||'—')}</td><td>${esc(r.os||'—')}</td><td>${fmtTs(r.first_seen)}</td><td>${fmtTs(r.last_seen)}</td></tr>`).join('');
+}
 
 // ---------- Integrations: API keys + webhooks (admin) ----------
 function fmtTs(ms){ return ms ? new Date(ms).toLocaleString() : '—'; }

server/public/index.html

@@ -10,6 +10,9 @@
   body{font-family:'Segoe UI',system-ui,sans-serif;background:var(--bg);color:var(--ink);margin:0;min-height:100vh;display:flex;flex-direction:column;}
   header{background:var(--blue);padding:.85rem 1.5rem;display:flex;justify-content:space-between;align-items:center;}
   .brandrow{display:flex;align-items:center;gap:.7rem;}
+  .hdr-right{display:flex;align-items:center;gap:.9rem;}
+  .dl-btn{display:inline-flex;align-items:center;gap:.4rem;background:#fff;color:var(--blue);padding:.45rem .85rem;border-radius:9px;font-size:.85rem;font-weight:700;text-decoration:none;white-space:nowrap;box-shadow:0 2px 8px rgba(0,0,0,.12);}
+  .dl-btn:hover{background:var(--brand);color:var(--blue);}
   .brand{font-weight:700;color:#fff;font-size:1.1rem;} .brand span{color:var(--brand);font-weight:600;}
   .signin{color:#dbe4f5;text-decoration:none;font-size:.9rem;border:1px solid #46598c;border-radius:8px;padding:.45rem 1rem;}
   .signin:hover{background:var(--blue-d);}
@@ -49,7 +52,10 @@
     <img src="/logo.png" alt="" style="height:40px;width:auto;max-width:170px;border-radius:8px;object-fit:contain;background:#fff;padding:4px 10px" onerror="this.style.display='none'">
     <div class="brand">Biz <span>Connect</span></div>
   </div>
+  <div class="hdr-right">
+    <a class="dl-btn" id="dlWin" href="/download/windows" title="Download the Windows desktop app"><span data-ic="download" data-sz="15"></span> Download app</a>
     <div id="authArea"></div>
+  </div>
 </header>
 <div class="wrap">
   <div class="inner">
@@ -67,7 +73,6 @@
     <!-- Team member path BELOW: log in to the full app. Stub SSO -> /home for now. -->
     <div class="divider" style="margin-top:1.6rem">BizGaze team member?</div>
     <a class="ssobtn" id="ssoBtn" href="/home"><span class="bmark">B</span> Log in with BizGaze</a>
-    <a class="dl-win" id="dlWin" href="/download/windows" style="display:inline-flex;align-items:center;gap:.5rem;margin-top:1rem;color:var(--blue);font-size:.88rem;text-decoration:none;font-weight:600"><span data-ic="download" data-sz="16"></span> Download the Windows desktop app</a>
   </div>
 </div>
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