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refactor(json): use functional loop in lex_skip_whitespace

Replace the `while` loop with a mutable `offset` local by a functional
`for offset = ctx.offset { ... continue offset + 1 }` loop, matching the
loop style used elsewhere in the JSON lexer (e.g. `lex_number`). The
loop yields the final offset via `break offset` and `ctx.offset` is
assigned once from the loop expression. The generated code is
equivalent: `offset` is still carried in a loop-local binding and
`ctx.offset` is written only once, on exit.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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