fix(switch): forward ref to the root view

[giaBaoJS]

Motivation

Switch accepts no ref. Props does not declare one, the component signature never destructures one, and the root <View style={[styles.wrapper, style]}> is not given one — so ref.current stays null and there is no way to measure() or otherwise reach the switch's host view.

This looks like a leftover from the Reanimated/Pressable rewrite: the surrounding components carry the prop over correctly (Appbar/AppbarBackAction.tsx, FAB/Extended.tsx, Surface.tsx, List/ListItem.tsx, TouchableRipple), Switch just did not.

Scope / correction to the issue

#3729 names both Avatar and Switch. I checked Avatar and it is not affected: AvatarText, AvatarIcon and AvatarImage all spread ...rest onto their root View, so a ref passed to them does land on the host view (I verified ref.current is non-null for all three). Their Props types just do not advertiseref, which is a typing gap rather than a runtime bug — happy to add the declarations in a follow-up if you want.

So this PR only fixes Switch. It does not close#3729 on its own, since that issue asks for the whole surface. One thing I did notice while looking: Banner.tsx declares ref?: React.RefObject<View> in its Props but never uses the value, so Banner drops refs too — again, happy to do that separately.

Note on the ref type

Peers use ref?: React.Ref<View>, but those all forward to a component whose props already carry React.RefAttributes<View> (Animated.View, Pressable, TouchableRipple). Switch's root is a plain <View>, and putting a React.Ref<View> on it fails yarn typecheck:

src/components/Switch/Switch.tsx(351,11): error TS2769: No overload matches this call.
Type 'import(".../node_modules/@types/react/index").Ref<View> | undefined' is not
assignable to type 'React.Ref<View> | undefined'.
... Two different types with this name exist, but they are unrelated.

tsc -b also builds docs/, which has its own copy of @types/react (same version, separate directory), and the unique symbol behind VoidOrUndefinedOnly in the callback-ref signature does not unify across the two copies. React.RefObject<View | null> is structural and unaffected, matches what React.createRef<View>() and useRef<View>(null) produce, and follows the existing declaration in Banner.tsx. Glad to switch it to React.Ref<View> if you'd rather fix the duplicate-types setup instead.

Test plan

Two cases added to src/components/__tests__/Switch.test.tsx:

• ref.current is not null
• ref.current.measure is a function (i.e. it is the host view, not some other object)

Both fail before the change (Received: null / Received: "undefined") and pass after.

yarn test: 55 suites, 737 passed / 1 skipped, 169 snapshots — no snapshot churn. yarn lint and yarn typecheck clean.

Refs #3729.