fix(native): cut circular variable resolution instead of blowing the stack

[YevheniiKotyrlo]

Summary

#451 cuts a custom-property cycle at runtime and in the compile-time inliner, which is what this PR fixed when I opened it. The code change is gone. What stays is coverage main does not have, because its cycle tests declare every cycle on one element:

• src/__tests__/native/variable-cycles.test.tsx:
  • A variable reaches a descendant unresolved, so a cycle can also close on the element that reads it. The cases are a variable that is itself, one reached again through a fallback, two that name each other, and one reached from two branches of one value.
  • Each case drops the declaration that reads the cycle, as Chromium 153, Firefox 155 and WebKit 26.6 do, while an unrelated variable still resolves.
  • Two cases pin what must not read as a cycle: an inherited variable read twice in one declaration, and a long inherited chain.
  • The cycle is also read through useUnstableNativeVariable.
• src/__tests__/compiler/variable-cycles.test.ts: the inliner leaves a cycle for the runtime and still folds a chain.

Tests

All 24 pass on main. Removing the inliner's guard, the resolver's guard, the pop of a resolved name, or the marking of a cycle each turns them red (4, 10, 2 and 1 cases).

Verification

On Windows with Node 26:

• yarn lint clean
• yarn typecheck clean
• yarn test --coverage: every failure also fails on main on this machine (the four babel cases)
• yarn build clean
• yarn example expo export --platform web exported

Base

Re-written on main (a5002c5) as tests only. Two expectations changed to what browsers compute:

• A cycle reached from two branches of one value drops the whole declaration; it does not keep a partial value.
• A * declaration outranks an inherited value. That case is about precedence rather than cycles, so it moved to test(native): cover custom-property precedence #443.

[YevheniiKotyrlo]

No device frame

This PR adds tests only. main already cuts a variable cycle (#451), so a device renders the same with and without it.