feat(viewer): add severity filtering for event logs

web/static/view.css

@@ -326,6 +326,45 @@ body {
   border-bottom: 1px solid var(--border-lite);
 }
 
+.table-block {
+  display: block;
+}
+
+.table-toolbar {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  margin: 0 0 10px;
+}
+
+.table-toolbar-label {
+  color: var(--muted);
+  font-size: 12px;
+  font-weight: 700;
+  letter-spacing: 0.04em;
+  text-transform: uppercase;
+}
+
+.table-severity-filter {
+  min-width: 180px;
+  border: 1px solid var(--border);
+  border-radius: 4px;
+  padding: 7px 10px;
+  background: var(--surface);
+  color: var(--ink);
+  font: inherit;
+}
+
+.table-severity-filter:focus-visible {
+  outline: 2px solid var(--accent);
+  outline-offset: 2px;
+}
+
+.table-filter-empty {
+  margin: 10px 0 0;
+  color: var(--muted);
+}
+
 /* ── Status ──────────────────────────────────────── */
 
 .status-badge {
@@ -370,4 +409,14 @@ body {
   .section-card-full {
     grid-column: auto;
   }
+
+  .table-toolbar {
+    align-items: stretch;
+    flex-direction: column;
+  }
+
+  .table-severity-filter {
+    min-width: 0;
+    width: 100%;
+  }
 }

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();
+  });
+});