fix(web): ignore malformed dashboard tile snapshots

apps/web/src/lib/client/dashboard-refresh.ts

@@ -231,7 +231,12 @@ export function createDashboardTileSnapshotStore(
         return null;
       }
 
-      return payload as DashboardTileSnapshotPayload;
+      return {
+        currentRevisionId: payload.currentRevisionId,
+        schemaVersion: payload.schemaVersion,
+        tiles: payload.tiles.filter(isDashboardTileSnapshotRecord),
+        version: 1,
+      };
     } catch {
       return null;
     }
@@ -332,6 +337,51 @@ function dashboardTileSnapshotKey(tile: DashboardTileReference): string {
   return JSON.stringify(tile);
 }
 
+function isDashboardTileSnapshotRecord(
+  value: unknown,
+): value is DashboardTileSnapshotRecord {
+  if (!isSnapshotRecord(value)) return false;
+
+  return (
+    typeof value.savedAt === "number" &&
+    Number.isFinite(value.savedAt) &&
+    isDashboardTileReference(value.tile) &&
+    isDashboardTileSnapshotItem(value.item)
+  );
+}
+
+function isDashboardTileReference(
+  value: unknown,
+): value is DashboardTileReference {
+  if (!isSnapshotRecord(value) || typeof value.kind !== "string") return false;
+
+  switch (value.kind) {
+    case "telemetry":
+    case "module":
+      return typeof value.id === "string";
+    case "service":
+      return typeof value.groupId === "string" && typeof value.id === "string";
+    case "status":
+      return typeof value.stripId === "string" && typeof value.id === "string";
+    default:
+      return false;
+  }
+}
+
+function isDashboardTileSnapshotItem(
+  value: unknown,
+): value is DashboardTileSnapshotItem {
+  return (
+    isSnapshotRecord(value) &&
+    typeof value.id === "string" &&
+    (value.detail === undefined || typeof value.detail === "string")
+  );
+}
+
+function isSnapshotRecord(value: unknown): value is Record<string, unknown> {
+  return typeof value === "object" && value !== null;
+}
+
 function staleDashboardTileDetail(
   detail: string | undefined,
   ageMs: number,