React Review Audit

Fix the following React Review diagnostics in my codebase.

## Errors (1)

1. [error] require-reduced-motion — package.json:0
   Project uses a motion library but has no prefers-reduced-motion handling — required for accessibility (WCAG 2.3.3)

## Warnings (15)

2. [warning] use-lazy-motion — src/components/TodoList/TodoCard/index.tsx:15
   Import "m" with LazyMotion instead of "motion" — saves ~30kb in bundle size

3. [warning] no-derived-useState — src/components/TodoList/TodoCard/index.tsx:24
   useState initialized from prop "todo" — if this value should stay in sync with the prop, derive it during render instead

4. [warning] use-lazy-motion — src/components/Header/index.tsx:22
   Import "m" with LazyMotion instead of "motion" — saves ~30kb in bundle size

5. [warning] design-no-three-period-ellipsis — src/pages/user/login.tsx:28
   Three-period ellipsis ("...") in JSX text — use the actual ellipsis character "…" (or `…`)

6. [warning] no-react19-deprecated-apis — src/components/EditTodoModal.tsx:11
   forwardRef is no longer needed on React 19+ — refs are regular props on function components; remove forwardRef and pass ref directly

7. [warning] prefer-useReducer — src/components/EditTodoModal.tsx:18
   Component "EditTodoModal" has 5 useState calls — consider useReducer for related state

8. [warning] no-derived-useState — src/components/EditTodoModal.tsx:19
   useState initialized from prop "todo" — if this value should stay in sync with the prop, derive it during render instead

9. [warning] no-derived-useState — src/components/EditTodoModal.tsx:20
   useState initialized from prop "todo" — if this value should stay in sync with the prop, derive it during render instead

10. [warning] no-derived-useState — src/components/EditTodoModal.tsx:21
   useState initialized from prop "todo" — if this value should stay in sync with the prop, derive it during render instead

11. [warning] no-derived-useState — src/components/EditTodoModal.tsx:22
   useState initialized from prop "todo" — if this value should stay in sync with the prop, derive it during render instead

12. [warning] design-no-default-tailwind-palette — src/components/AddTodo.tsx:50
   text-slate-300 reads as the Tailwind template default — use zinc (true neutral), neutral (warmer), or stone (warmest)

13. [warning] design-no-default-tailwind-palette — src/components/AddTodo.tsx:59
   text-slate-600 reads as the Tailwind template default — use zinc (true neutral), neutral (warmer), or stone (warmest)

14. [warning] design-no-default-tailwind-palette — src/components/AddTodo.tsx:59
   text-slate-500 reads as the Tailwind template default — use zinc (true neutral), neutral (warmer), or stone (warmest)

15. [warning] nextjs-no-font-link — src/pages/_document.tsx:12
   Loading Google Fonts via <link> — use next/font instead for self-hosting, zero layout shift, and no render-blocking requests

16. [warning] nextjs-no-font-link — src/pages/_document.tsx:18
   Loading Google Fonts via <link> — use next/font instead for self-hosting, zero layout shift, and no render-blocking requests