fix(layout): skip layout updates when container size is 0x0

[sharabai]

Description

Fixes #2231

When FlashList is mounted inside a screen rendered by @react-navigation/stack on web, pushing a new screen on top of it transiently measures FlashList's container as 0x0. The two layout useLayoutEffects in RecyclerView then run with those bogus dimensions: the first overwrites the window/layout params with zeros, and the second walks every viewHolderRef and rewrites item layouts. The downstream effect is that every renderItem re-runs — including offscreen items — which defeats recycling and causes the perf regression in the linked Snack repro.

This PR adds two early returns inside src/recyclerview/RecyclerView.tsx:

1. In the post-mount layout effect: if the outer container measures 0x0, store that size in containerViewSizeRef and bail out before calling recyclerViewManager.updateLayoutParams(...).
2. In the per-item layout effect: if containerViewSizeRef.current is 0x0, bail out before iterating refHolder and rewriting layouts.

Once the screen is brought back into view and the container regains a non-zero size, the normal layout path resumes on the next layout pass — no items are dropped or re-mounted.

This is the same patch Expensify currently ships against @shopify/flash-list@2.3.0 for the same root cause discussed in #1816, and it removes the need for consumers to remember to toggle a Navigator-level workaround at every call site.

Reviewers' hat-rack 🎩

• Confirm the first early return still writes containerViewSizeRef.current = outerViewSize before bailing, so the second effect can detect the 0x0 state.
• Reproduce Rendering of all data when navigating with @react-navigation/stack #2231 against main using the Snack from the issue, then re-run against this branch and verify offscreen items stop re-rendering when a stack screen is pushed on top.
• Verify there's no regression on lists that legitimately mount with non-zero size on the first measurement (mobile + web), i.e. the fast path is unchanged.
• Sanity-check that layout converges on the next non-zero measurement after the container is restored — items shouldn't be left half-measured.

Screenshots or videos

After-fix recording:

fixed.navigation.mp4

[sharabai]

CLA is signed.

[sharabai]

@naqvitalha could you take a look at this PR when you have some free time on your hands?