Add spot sell retry UI; sell all trading-account coin on sell-back.

Fix coin-margin sell-back to use full available balance instead of bridge record; show retry banner and button on the options positions panel.

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

lib/options/options_register.py

@@ -1423,7 +1423,33 @@ def register_options_routes(app: Flask, cfg: dict[str, Any]) -> None:
                 rows.append(row)
         finally:
             conn.close()
-        return jsonify({"ok": True, "positions": rows})
+        spot_sell_hint = None
+        try:
+            from lib.options.options_margin_mode_lib import is_coin_margin_mode
+
+            if is_coin_margin_mode():
+                from lib.options.options_spot_bridge_lib import list_open_bridges
+
+                conn_b = cfg["get_db"]()
+                try:
+                    from lib.options.options_db import init_options_tables
+
+                    init_options_tables(conn_b)
+                    open_bridges = list_open_bridges(conn_b)
+                    bal = cfg["fetch_options_balances"](ex, scope="main")
+                    bridge = open_bridges[0] if open_bridges else None
+                    spot_sell_hint = {
+                        "bridge_status": str(bridge.get("status") or "") if bridge else None,
+                        "bridge_underlying": str(bridge.get("underlying") or "").upper() if bridge else None,
+                        "trading_eth": bal.get("trading_eth_avail") or bal.get("trading_eth"),
+                        "trading_btc": bal.get("trading_btc_avail") or bal.get("trading_btc"),
+                        "default_underly": (cfg.get("default_underly") or "ETH").strip().upper(),
+                    }
+                finally:
+                    conn_b.close()
+        except Exception:
+            spot_sell_hint = None
+        return jsonify({"ok": True, "positions": rows, "spot_sell": spot_sell_hint})
 
     @app.route("/api/options/targets")
     @lr