Stop browser autofill stuffing login username into transfer amount fields.

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/options/templates/options_settings_swap.html

@@ -1,11 +1,14 @@
 <div class="options-settings-section">
     <p class="options-settings-hint">主账户资金账户:USDT ↔ USDC 现货市价单.</p>
     <div class="form-row settings-transfer-form options-settings-row">
-        <select id="opt-set-swap-dir" aria-label="兑换方向">
+        <input type="text" name="username" autocomplete="username" tabindex="-1" aria-hidden="true"
+               style="position:absolute;left:-9999px;width:1px;height:1px;opacity:0" value="">
+        <select id="opt-set-swap-dir" aria-label="兑换方向" autocomplete="off">
             <option value="usdt_to_usdc" selected>USDT → USDC</option>
             <option value="usdc_to_usdt">USDC → USDT</option>
         </select>
-        <input type="number" id="opt-set-swap-amount" min="0.01" step="0.01" placeholder="数量">
+        <input type="number" id="opt-set-swap-amount" name="cm_opt_swap_amt" min="0.01" step="0.01" placeholder="数量"
+               autocomplete="off" inputmode="decimal" data-lpignore="true" data-1p-ignore="true" data-bwignore="true" data-form-type="other" readonly>
         <button type="button" class="btn-secondary btn-sm" id="opt-set-swap-all-btn">全部兑换</button>
         <button type="button" class="btn-primary btn-sm" id="opt-set-swap-btn">市价兑换</button>
     </div>