Buy flow: balance pre-flight; Trust Wallet users get a drain-warning heads-up

Stops early when the wallet lacks the POL. Only Trust Wallet users see the
proportion warning (smaller package / add POL / other wallet); everyone else
goes straight to the wallet confirmation. Buy-pane tip + chatbot reworded.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

public/my.html

@@ -322,6 +322,8 @@
           <h3>Buy an ad package</h3>
           <p class="muted small">Priced in dollars, settled from your wallet at the live rate. Credits mint
             to this account instantly, and every payout in your sponsor line lands the moment you confirm.</p>
+          <p class="small" style="border:1px solid var(--line-strong);border-radius:10px;padding:10px 12px;margin:0 0 14px">
+            <b>Using Trust Wallet?</b> It blocks purchases that spend most of the POL in the wallet (a "drain your wallet" warning). Start with a smaller package, keep a little extra POL, or connect MetaMask, Phantom or SafePal instead. Extra POL always stays yours.</p>
           <div class="tiles" id="boTiles"><div class="tile"><span class="muted small">Loading live prices…</span></div></div>
         </div>
       </div>
@@ -735,9 +737,9 @@
   </div>
 </div>
 <script src="/assets/common.js?v=20260909a"></script>
-<script src="/assets/wallet.js?v=20260909a"></script>
+<script src="/assets/wallet.js?v=20260909b"></script>
 <script src="/assets/promo.js?v=20260909b"></script>
-<script src="/assets/my.js?v=20260909e"></script>
+<script src="/assets/my.js?v=20260909f"></script>
 <script src="/assets/chat.js?v=20260907l"></script>
 </body>
 </html>