Keep settings on transfer tab after manual USDT transfer redirect.

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

crypto_monitor_binance/app.py

@@ -9870,7 +9870,7 @@ def manual_transfer():
         amount = float(request.form.get("amount", "0"))
     except Exception:
         flash("划转金额格式错误")
-        return redirect("/settings")
+        return redirect("/settings?tab=transfer")
     from_account = (request.form.get("from_account") or AUTO_TRANSFER_FROM).strip()
     to_account = (request.form.get("to_account") or AUTO_TRANSFER_TO).strip()
     ok, msg, _ = execute_transfer_usdt(amount, from_account, to_account)
@@ -9885,7 +9885,7 @@ def manual_transfer():
         flash(f"手动划转成功:{amount}U {from_account}->{to_account}")
     else:
         flash(f"手动划转失败:{msg}")
-    return redirect("/settings")
+    return redirect("/settings?tab=transfer")
 
 
 def _journal_ai_chart_builder(row):