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fix(web): remove falsy sole-child primitives when replacing content (#3573)

* fix(web): remove falsy sole-child primitives when replacing content

A sole dynamic child of 0 or NaN is tracked as the raw primitive. Truthiness
checks in insertExpression skipped cleanup, so a later element or array was
appended beside the old text node and zeros accumulated on later toggles.

* test(web): pin the hydration variant of the falsy sole-child cleanup (#3571)

Array.isArray(current) drops the last truthiness read of current in insertExpression.

Co-authored-by: Claude via Cursor <noreply@cursor.com>

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Co-authored-by: Bennett Payoyo <Yahiro025@users.noreply.github.com>
Co-authored-by: Ryan Carniato <ryansolid@gmail.com>
Co-authored-by: Claude via Cursor <noreply@cursor.com>

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