feat: add portfolio overview

frontend/src/styles/index.css

@@ -341,6 +341,33 @@ button {
   color: var(--color-text-muted);
 }
 
+.portfolio {
+  margin-bottom: 20px;
+}
+
+.portfolio__header {
+  display: flex;
+  align-items: flex-end;
+  justify-content: space-between;
+  gap: 16px;
+  margin-bottom: 12px;
+}
+
+.portfolio__title {
+  font-size: 18px;
+  font-weight: 850;
+}
+
+.portfolio__meta {
+  margin-top: 3px;
+  color: var(--color-text-secondary);
+}
+
+.portfolio__total {
+  font-size: 20px;
+  font-variant-numeric: tabular-nums;
+}
+
 /* ================================================================
    Forms, buttons, badges
    ================================================================ */
@@ -1462,6 +1489,11 @@ input[type="checkbox"] {
     width: 100%;
   }
 
+  .portfolio__header {
+    align-items: flex-start;
+    flex-direction: column;
+  }
+
   .filters__row,
   .analytics-panel__filters {
     align-items: stretch;