Pass saved alias to platform on launch; copy to clipboard

- platforms table gets url_alias_param column (configurable per platform)
- Admin game form has new "Username URL Param" field — leave blank if platform
  doesn't support it, or set to e.g. "username" if it does
- Platform cards now use onclick openPlatform() instead of plain href:
  copies player's saved alias to clipboard on every click, and if
  url_alias_param is set appends ?param=alias to the launch URL
- Toast notification confirms "Alias copied — paste into login"

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

index.php

@@ -661,6 +661,7 @@ body::before{content:'';position:fixed;inset:0;background-image:linear-gradient(
     </div>
     <div class="section-title"><span>PLAY NOW</span></div>
     <div class="platform-grid" id="platform-grid"></div>
+    <div id="platform-alias-toast" style="position:fixed;bottom:80px;left:50%;transform:translateX(-50%) translateY(10px);background:rgba(0,0,0,.88);color:#fff;font-size:14px;font-weight:700;padding:10px 18px;border-radius:24px;white-space:nowrap;opacity:0;transition:opacity .3s,transform .3s;pointer-events:none;z-index:999;border:1px solid rgba(0,229,255,.25)"></div>
   </div>
 
   <!-- ═══ BUY TOKENS (milkyswipe style) ═══ -->
@@ -1405,19 +1406,40 @@ async function refreshUser() {
 }
 
 // ─── PLATFORMS ─────────────────────────────────────────────
+function openPlatform(slug, url, aliasParam) {
+  const alias = savedAliases[slug] || '';
+  let launchUrl = url;
+  if (alias && aliasParam) {
+    const sep = url.includes('?') ? '&' : '?';
+    launchUrl = url + sep + encodeURIComponent(aliasParam) + '=' + encodeURIComponent(alias);
+  }
+  window.open(launchUrl, '_blank', 'noopener');
+  if (alias) {
+    navigator.clipboard?.writeText(alias).catch(() => {});
+    const t = document.getElementById('platform-alias-toast');
+    if (t) {
+      t.textContent = '📋 "' + alias + '" copied — paste into login';
+      t.style.opacity = '1'; t.style.transform = 'translateY(0)';
+      clearTimeout(t._timer);
+      t._timer = setTimeout(() => { t.style.opacity='0'; t.style.transform='translateY(10px)'; }, 3000);
+    }
+  }
+}
+
 function buildPlatforms() {
   if (!CFG.platforms || !CFG.platforms.length) return;
 
   const grid = document.getElementById('platform-grid');
   if (grid) {
     grid.innerHTML = CFG.platforms.map(p => `
-    <a href="${p.url}" target="_blank" class="platform-card" style="--p-color:${p.color}">
+    <div class="platform-card" style="--p-color:${p.color};cursor:pointer"
+         onclick="openPlatform('${p.id}',${JSON.stringify(p.url)},${JSON.stringify(p.alias_param||'')})">
       <div class="platform-img-wrap">
         <img src="/assets/img/${p.id}.svg" alt="${p.name}" onerror="this.style.display='none'">
       </div>
       <div class="platform-name">${p.name}</div>
       <div class="play-btn">TAP TO PLAY →</div>
-    </a>`).join('');
+    </div>`).join('');
   }
 
   // Populate selects — clear dynamic options first to prevent duplicates on re-call