Match Qwen Unicode number token boundaries

docs/issue111-tokenizer/scalar-split.json

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+{"scalars": 1112064, "pieces": 2082513, "sha256": "7ef8755fb56062d9695b38bc132f325ea59c3c65f198e1b1ab20bff1afef632a", "pattern": "(?i:'s|'t|'re|'ve|'m|'ll|'d)|[^\\r\\n\\p{L}\\p{N}]?[\\p{L}\\p{M}]+|\\p{N}| ?[^\\s\\p{L}\\p{M}\\p{N}]+[\\r\\n]*|\\s*[\\r\\n]+|\\s+(?!\\S)|\\s+"}