fix(app): persist defensiveness (#12973)

packages/app/src/utils/persist.test.ts

@@ -99,4 +99,9 @@ describe("persist localStorage resilience", () => {
 
     expect(storage.getItem("direct-value")).toBe('{"value":5}')
   })
+
+  test("normalizer rejects malformed JSON payloads", () => {
+    const result = persistTesting.normalize({ value: "ok" }, '{"value":"\\x"}')
+    expect(result).toBeUndefined()
+  })
 })