Add confirm dialogs and busy states for swap/transfer all actions.

Use available (free) balances for full-amount ops, support sub-account scope, and show clear success/failure feedback.

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

lib/options/templates/options_settings_panel.html

@@ -1,4 +1,4 @@
 {# 期权设置脚本挂载点(卡片在 settings_panel 中拆分) #}
 <div id="options-settings-root" hidden
      data-sub-account="{{ instance_settings.options_sub_account | default('', true) }}"></div>
-<script src="/static/options_settings.js?v=7"></script>
+<script src="/static/options_settings.js?v=8"></script>