fix(compile-core): track KeepAlive as block inside v-for

[edison1105]

close #12914

Summary by CodeRabbit

• Bug Fixes

  • Improved handling of components wrapped in KeepAlive inside v-for loops so they are tracked and lifecycle-managed correctly even when fragments are stable.

• Tests

  • Added a test verifying KeepAlive children are properly unmounted and remounted when dynamically switched within a keyed list wrapped by a stable fragment.

[openhands-ai[bot]]

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@OpenHands please fix the failing actions on PR #8785

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