fix: avoid selecting active option when Enter confirms IME composition

[greymoth-jp]

When the dropdown is open in a searchable Select, the keydown handler in BaseSelect forwards Enter to the option list and selects the active option whenever key === 'Enter', without checking whether that Enter is confirming an IME composition.

So when a user types CJK text (Japanese/Chinese/Korean), the first option is highlighted by defaultActiveFirstOption, and the Enter the user presses to confirm the IME conversion selects that highlighted option before they have finished composing. Selector already guards this for the tags-mode submit with !compositionStatusRef.current, but the option-selection path in BaseSelect was missing the equivalent check.

This shows up on browsers where the Enter that confirms the composition still reports keyCode === 13, the same case the Selector already handles for tags mode. In Chrome the option list's which switch misses it (keyCode is 229 there), but isComposing is set in every browser, so it is the reliable thing to check.

Fix: skip the option-list keydown when the Enter is confirming a composition (event.nativeEvent.isComposing).

Added tests/Composition.test.tsx: a composing Enter no longer fires onChange/onSelect, while a normal Enter still selects the active option. Full suite stays green.

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