Speed up journal save with AJAX and async K-line charts.

Defer exchange chart generation to a background thread and save via XHR so fill-from-trade no longer blocks on full page reload.

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

lib/instance/templates/index.html

@@ -456,6 +456,7 @@
 <script src="/static/time_close_ui.js?v=3"></script>
 <script src="/static/ai_review_render.js?v=2"></script>
 <script src="/static/form_submit_guard.js?v=2"></script>
+<script src="/static/journal_form_save.js?v=1"></script>
 <script>
 const ORDER_ENTRY_MODEL_TRADE_STYLE = {{ entry_model_trade_style_map | tojson }};
 const ORDER_ENTRY_MODEL_CATEGORIES = {{ entry_model_categories | tojson }};
@@ -1823,13 +1824,6 @@ if(window.ManualOrderRrPreview){
 
 refreshAccountSnapshot();
 if (window.AccountRiskBadge) AccountRiskBadge.startTicker();
-const _journalFormEl = document.getElementById("journal-form");
-if(_journalFormEl){
-    _journalFormEl.addEventListener("submit", function(ev){
-        if(!validateJournalEntryReason()) ev.preventDefault();
-    });
-}
-
 const addOrderForm = document.getElementById("add-order-form");
 if(addOrderForm){
     addOrderForm.addEventListener("submit", function(ev){