Manual fixes after the codemod

Known gaps to handle explicitly

@react-spectrum/toast imports are not automatically migrated. Move them to S2, then re-check ToastContainer mounts and ToastQueue usages.
v3 Provider and defaultTheme wrappers in apps and tests need human review. S2 does not use the v3 theme object model.

Collapse v3 component imports onto @react-spectrum/s2.
Keep using @spectrum-icons/* only when there is no S2 icon or illustration equivalent. Prefer @react-spectrum/s2/icons/* and @react-spectrum/s2/illustrations when possible.
If the codemod leaves TODO(S2-upgrade) next to an icon or illustration import, pick the nearest S2 replacement manually.

Full-page apps usually add import '@react-spectrum/s2/page.css'; at the entrypoint and no longer need a mandatory root Provider just to supply theme={defaultTheme}.
Embedded sections still use S2 Provider with an explicit background.
Keep or add S2 Provider only when locale, router integration, color-scheme/background overrides, or SSR elementType="html" behavior are needed.
Preserve unrelated wrappers such as routing, store, analytics, i18n, and host-framework providers. Replace or remove only the React Spectrum-specific layer.

Convert v3 style props and UNSAFE_style cases to the S2 style macro when possible.
Flex and Grid often become div elements styled with the macro.
Review ClearSlots and other direct @react-spectrum/utils imports manually. These are not part of the common S2 app surface.

DialogContainer and useDialogContainer still exist in S2, but the import path changes and dismiss logic may need to move between Dialog, DialogTrigger, and DialogContainer.
When Item survives the codemod, rename it based on its parent: MenuItem, PickerItem, ComboBoxItem, ListBoxItem, Tab, TabPanel, Tag, Breadcrumb, and similar.
Preserve React key when mapping arrays, but ensure collection data items expose id when S2 expects it.
Table and ListView migrations often need manual review for row headers, nested columns, and explicit item ids.

Replace v3 Provider/defaultTheme test wrappers with the minimal S2 Provider props the test actually needs, or remove the wrapper entirely if no S2 context is required.
Update toast mocks and assertions that still reference @react-spectrum/toast or old dialog markup.