Add pre-buy expiry breakeven columns to options chain table.

Show estimated expiry balance and distance from index in the chain list and order panel using ask price before opening a position.

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

lib/common/static/instance_theme.css

@@ -2588,6 +2588,18 @@ html[data-theme="light"] .settings-side-export-label {
 .options-page-wrap .options-strike-table code {
   font-size: 0.66rem;
 }
+.opt-be-dist-up {
+  color: #5ee89a;
+}
+.opt-be-dist-down {
+  color: #ff8a8a;
+}
+html[data-theme="light"] .opt-be-dist-up {
+  color: #0d7a45;
+}
+html[data-theme="light"] .opt-be-dist-down {
+  color: #c62828;
+}
 .options-chain-toolbar .btn-secondary.active,
 .opt-uly-btn.active,
 .opt-type-btn.active {