fix(portal): account summary 500 — open_balance can't use t-field

t-field requires a record.field_name access pattern. open_balance is a
Python float (returned by _fp_account_summary_open_balance), not a
recordset attribute, so QWeb threw AssertionError at render time and
the page 500'd. Format the value in the controller via tools.formatLang
and render it as a plain string with t-out instead.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

fusion_plating/fusion_plating_portal/controllers/portal.py

@@ -10,6 +10,7 @@ from datetime import datetime, time as dt_time
 from odoo import _, http
 from odoo.exceptions import AccessError, MissingError
 from odoo.http import request
+from odoo.tools import formatLang
 from odoo.addons.portal.controllers.portal import (
     CustomerPortal,
     pager as portal_pager,
@@ -551,6 +552,11 @@ class FpCustomerPortal(CustomerPortal):
             step=self._FP_ACCOUNT_SUMMARY_PER_PAGE,
         )
 
+        currency = (
+            commercial.property_account_receivable_id.currency_id
+            if commercial.property_account_receivable_id
+            else request.env.company.currency_id
+        )
         values = self._prepare_portal_layout_values()
         values.update({
             'page_name': 'fp_account_summary',
@@ -561,8 +567,8 @@ class FpCustomerPortal(CustomerPortal):
             'search': search,
             'sort': sort,
             'open_balance': open_balance,
-            'currency': commercial.property_account_receivable_id.currency_id
-                if commercial.property_account_receivable_id else request.env.company.currency_id,
+            'open_balance_display': formatLang(request.env, open_balance, currency_obj=currency),
+            'currency': currency,
             'pager': pager,
             'total': data['total'],
         })

fusion_plating/fusion_plating_portal/views/fp_portal_account_summary.xml

@@ -15,8 +15,7 @@
                     <div class="o_fp_badge o_fp_badge_paid" t-if="open_balance">
                         <span class="o_fp_badge_dot"/>
                         Open Balance:
-                        <span t-field="open_balance"
-                              t-options='{"widget": "monetary", "display_currency": currency}'/>
+                        <span t-out="open_balance_display"/>
                     </div>
                     <span class="o_fp_badge" t-else=""
                           style="background:#f3f7f6;color:#374151">