feat(viewer): add severity filtering for event logs

web/static/view.js

@@ -0,0 +1,31 @@
+document.addEventListener("DOMContentLoaded", () => {
+  document.querySelectorAll(".table-filterable").forEach((container) => {
+    const select = container.querySelector(".table-severity-filter");
+    if (!select) {
+      return;
+    }
+
+    const rows = Array.from(container.querySelectorAll("tbody tr[data-severity-row='true']"));
+    const emptyNotice = container.querySelector(".table-filter-empty");
+
+    const applyFilter = () => {
+      const selected = select.value;
+      let visibleCount = 0;
+
+      rows.forEach((row) => {
+        const matches = selected === "" || row.dataset.severity === selected;
+        row.hidden = !matches;
+        if (matches) {
+          visibleCount += 1;
+        }
+      });
+
+      if (emptyNotice) {
+        emptyNotice.hidden = visibleCount !== 0;
+      }
+    };
+
+    select.addEventListener("change", applyFilter);
+    applyFilter();
+  });
+});