## Summary
Fixed GitHub issue #1433 - "Clicking on add review comment button no longer focus on the edit box"
### Changes Made
**1. `frontend/src/components/ui/wysiwyg.tsx`** (+5 lines)
- Added import for `AutoFocusPlugin` from `@lexical/react/LexicalAutoFocusPlugin`
- Added `autoFocus?: boolean` prop to `WysiwygProps` type
- Conditionally renders `<AutoFocusPlugin />` when `autoFocus` is true and editor is editable
**2. `frontend/src/components/diff/CommentWidgetLine.tsx`** (+1 line)
- Added `autoFocus` prop to the `WYSIWYGEditor` when creating new review comments
**3. `frontend/src/components/diff/ReviewCommentRenderer.tsx`** (+1 line)
- Added `autoFocus` prop to the `WYSIWYGEditor` when editing existing review comments
### Verification
- TypeScript type check: Passed
- ESLint: Passed
- Prettier: Passed
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