Fix inverted list wheel scrolling over its own surface

[huytdps13400]

Wheel events over an inverted list's own padding or gutter are currently handled as if the scroller were a nested scrollable child. This applies the delta in the ordinary direction; near a boundary, the same element can receive writes in both directions.

Only treat the event target as a nested scrollable when it differs from the listener's currentTarget. The scroller then receives the full inverted delta, while genuine descendants continue consuming their portion first.

Fixes #2843.

Validation

• Added 16 DOM-event regression/control tests across vertical and horizontal lists: positive/negative wheel deltas, the scroller surface near a boundary, ordinary row targets, nested scrollables with room or overflow, and non-inverted lists. On the base, 6 regression cases fail and 10 controls pass; all pass after the change.
• Real mouse-wheel input in Chrome 153 on a rendered FlatList using React 18.3.1 reproduced the report: a gutter wheel of 120 moved the list +120, while the same wheel over a row moved it −120. After the fix, both move −120. Nested content still consumes 120 itself, and passes 110 to the inverted parent when only 10 remains available. Ten browser checks pass across explicit getItemLayout and measured layouts.
• Full DOM and Node suites: 737 tests passed, 6 skipped, 220 snapshots passed. Lint, formatting and the library build pass.
• Flow 0.148 cannot execute on this ARM host because its packaged macOS executable is x86_64 (spawn error −86), so Flow validation is unverified locally. The GitHub CI type-check, format, lint, unit-test, compressed-size and CodeSandbox checks have since all passed.

The existing cell-length clamp and the separate nested-inverted-list propagation proposal in #2772 are outside this change.

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