feat(portal): Account Summary template (3 tabs, filter, search, sort, pager)

Tabs: Invoices / Credit Memos / Statements (V1 placeholder).
Page header carries the Open Balance pill. Per-tab filter pills
(Open/Closed/All), search box (name OR ref), sort dropdown
(newest/oldest/largest/smallest), 10-per-page pager.

Empty states: 'No results for X' for failed searches, 'No records
in this tab' for empty result sets, and the dedicated Statements
'coming soon' card. Statements tab hides the filter/search/sort
strip — nothing to filter yet.

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

fusion_plating/fusion_plating_portal/static/src/scss/fp_portal_dashboard.scss

@@ -270,3 +270,21 @@
         }
     }
 }
+
+// Filter pills used by Account Summary (also reusable elsewhere)
+.o_fp_filter_pill {
+    display: inline-block;
+    padding: .25rem .75rem;
+    border-radius: $fp-radius-pill;
+    background: $fp-section-bg;
+    color: $fp-muted;
+    font-size: .8rem;
+    text-decoration: none;
+    transition: background .12s ease, color .12s ease;
+    &:hover { background: $fp-mint; color: $fp-teal-dark; text-decoration: none; }
+    &.o_fp_filter_pill_active {
+        background: $fp-gradient-primary;
+        color: #fff;
+        font-weight: 600;
+    }
+}