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align String::pad_start with JS semantics (not counting char length)

the rationale is that counting char_length is not enough, we need do more complex graphime.

Bottom Line
I'd follow JavaScript's semantics because:
It maintains consistency with your UTF-16-based API
It's predictable and performant
Most real padding use cases don't involve emojis
You can always add character-aware variants later if needed
The current design mixing UTF-16 offsets with character counting creates more confusion than the occasional visual incorrectness with emojis.

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