fix(network): handle non-UTF-8 bytes in post_data without raising

[wali-reheman]

post_data.decode() used strict UTF-8 decoding which raises UnicodeDecodeError when the POST body contains invalid UTF-8 bytes. Use errors='replace' to return a best-effort string, matching the JavaScript Playwright API. post_data_buffer remains the binary-safe API.

Fixes #3098

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