fix: prevent "852,500" corruption in Finance Ledger calculate

When actor.update() fires, Foundry auto-submits any open character
sheet form before re-rendering. If the sheet still showed the old
credits value (e.g. 500), that stale value raced the new one (852)
and got merged server-side into the corrupt string "852,500".

Fix: pass {render: false} to actor.update() so Foundry skips the
auto-submit entirely, then manually call app.render() on all open
sheets for that actor — they read fresh data and render cleanly.

system.json

@@ -2,7 +2,7 @@
   "id": "zero-engine",
   "title": "Zero Engine (SLA Industries)",
   "description": "A basic game system for SLA Industries using the Zero Engine rules.",
-  "version": "1.5.0",
+  "version": "1.5.1",
   "compatibility": {
     "minimum": 13,
     "verified": "14.359"

zero-engine.mjs

@@ -5602,6 +5602,9 @@ class SLAGMFinanceTool extends Application {
     const current  = this._readCredits(actor);
     const newBal   = current + income - expenses;
 
+    // {render: false} stops Foundry from auto-submitting open character sheets
+    // before they re-render, which was causing stale form values (e.g. 500)
+    // to be merged with the new value (e.g. 852) into a corrupt "852,500" string.
     await actor.update({
       'system.details.credits':                  newBal,
       'system.finances.income.salary':           0,
@@ -5614,7 +5617,12 @@ class SLAGMFinanceTool extends Application {
       'system.finances.expenses.bulletTax':      0,
       'system.finances.ammoSpentSession':        0,
       'system.finances.debt':                    0
-    });
+    }, { render: false });
+
+    // Now re-render any open sheets for this actor cleanly from fresh data.
+    for (const app of Object.values(actor.apps ?? {})) {
+      app.render(false);
+    }
 
     ui.notifications.info(
       `${actor.name}: ${current}c + ${income}c income − ${expenses}c expenses = ${newBal}c`