feat(reports): hide metrics in frontend reports UI

Add useHiddenMetrics composable to filter hidden metrics from
report keys. Update WootReports.vue to use the composable so
hidden metrics are not fetched or displayed in the reports UI.

app/javascript/dashboard/composables/useHiddenMetrics.js

@@ -0,0 +1,31 @@
+import { computed } from 'vue';
+import { useStore } from 'dashboard/composables/store';
+
+// Bidirectional alias mapping for consistency
+const METRIC_ALIASES = {
+  avg_reply_time: 'reply_time',
+};
+
+export function useHiddenMetrics() {
+  const store = useStore();
+
+  const hiddenMetrics = computed(() => {
+    return (
+      store.getters.getCurrentAccount?.settings?.report_hidden_metrics || []
+    );
+  });
+
+  const isMetricHidden = metricKey => {
+    const normalized = METRIC_ALIASES[metricKey] || metricKey;
+    return hiddenMetrics.value.includes(normalized);
+  };
+
+  const filterVisibleReportKeys = reportKeys => {
+    // Filter out hidden metrics from reportKeys object
+    return Object.fromEntries(
+      Object.entries(reportKeys).filter(([, value]) => !isMetricHidden(value))
+    );
+  };
+
+  return { hiddenMetrics, isMetricHidden, filterVisibleReportKeys };
+}