fix(web): ignore malformed dashboard tile snapshots

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

@@ -164,6 +164,15 @@ describe("dashboard refresh lifecycle", () => {
       },
       schemaVersion: "dashboard.v1",
     });
+    store.saveTile({
+      currentRevisionId: "revision-a",
+      response: {
+        state: "disabled",
+        tile: { kind: "module", id: "disabled-module" },
+        message: "Disabled",
+      },
+      schemaVersion: "dashboard.v1",
+    });
 
     now = 61_000;
 
@@ -193,6 +202,53 @@ describe("dashboard refresh lifecycle", () => {
       schemaVersion: "dashboard.v1",
     })).toEqual([]);
   });
+
+  test("ignores malformed stored tile snapshots", () => {
+    const storage = createMemoryStorage();
+    storage.setItem(
+      "dimensionlab.dashboard.tiles.v1",
+      JSON.stringify({
+        currentRevisionId: "revision-a",
+        schemaVersion: "dashboard.v1",
+        tiles: [
+          {},
+          {
+            item: { id: "infra-ram", detail: "live" },
+            savedAt: 1_000,
+            tile: { kind: "telemetry", id: "infra-ram" },
+          },
+          {
+            item: { id: "broken-detail", detail: 42 },
+            savedAt: 1_000,
+            tile: { kind: "telemetry", id: "broken-detail" },
+          },
+        ],
+        version: 1,
+      }),
+    );
+
+    const store = createDashboardTileSnapshotStore(storage, {
+      now: () => 16_000,
+    });
+
+    expect(store.restore({
+      currentRevisionId: "revision-a",
+      schemaVersion: "dashboard.v1",
+    })).toEqual([
+      {
+        ageMs: 15_000,
+        response: {
+          state: "ready",
+          tile: { kind: "telemetry", id: "infra-ram" },
+          item: {
+            id: "infra-ram",
+            detail: "live - stale 15s",
+            severity: "stale",
+          },
+        },
+      },
+    ]);
+  });
 });
 
 async function waitFor(predicate: () => boolean) {