Add storage utils tests + extend todo-context hydration/persistence tests

[codegen-sh]

Requested by: Jake Ruesink

Summary
Adds missing unit tests for storage utilities and extends todo-context tests to validate hydration and persistence flows for the new localStorage integration.

What

• packages/utils/src/tests/storage.test.ts (new)
  • Verifies SSR/test guard returns fallback
  • Malformed JSON returns fallback
  • Optional validate guard path (accepts/rejects)
  • save/remove round-trip behavior
• apps/todo-app/app/lib/tests/todo-context.test.tsx (extended)
  • Hydration revives dates (via provider mount reading from storage and reviving createdAt/updatedAt)
  • Persistence triggers on addTodo, toggleTodo, setFilter (spy on saveToStorage)
  • Guarded against unavailable window/localStorage

Notes

• Utils tests use a jsdom-safe localStorage polyfill when needed and flip NODE_ENV to exercise the storage path safely.
• Todo app already has jsdom setup; we isolate persistence behaviors and do not alter other existing component tests.

Compliance with org/repo rules

• Branch created from base branch
• Lint/typecheck to be run by CI; focused only on requested test coverage
• No time estimates included

Links

• Linear: https://linear.app/lambdacurry/issue/STA-10/testing-add-storage-hydration-tests-utils-todo-context

Requested by: Jake Ruesink

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[linear]

STA-10 [Testing] Add storage + hydration tests (utils + todo-context)

Requested by: Jake Ruesink

Summary
Increase confidence in the new persistence path by adding tests that cover storage guards, validation fallback, hydration date revival, and persistence triggers.

Base branch for PR: codegen-bot/persist-todos-localstorage-STA-2-1754688724
Target repo: lambda-curry/react-router-starter

Code context

1. Add: packages/utils/src/tests/storage.test.ts

• Cover:
  • SSR/test guard disables storage
  • Malformed JSON returns fallback
  • Optional validate guard path (accept and reject)
  • save/remove round-trip behavior

2. Extend: apps/todo-app/app/lib/tests/todo-context.test.tsx

• Cover:
  • Hydration revives dates (createdAt/updatedAt are Date after mount)
  • Persistence triggers on: addTodo, toggleTodo, setFilter
  • No SSR errors when window/localStorage not available

Testing notes

• Mock window.localStorage in JSDOM-safe ways.
• Use spies to assert saves, and manually seed storage JSON for hydration tests.

Acceptance criteria

• Tests pass locally and in CI.
• Regressions like invalid JSON in storage or missing SSR guards are caught by tests.

References

• PR Persist todos in localStorage + minimal storage utils (STA-2) #7: Persist todos in localStorage + minimal storage utils (STA-2) #7 (review item 4)

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