b9979

mtmd: fix silent prompt truncation on embedded NUL (#25548)

• mtmd: fix silent prompt truncation on embedded NUL

mtmd_input_text carried the prompt as a bare const char* with no
length, so a NUL byte in message content cut the prompt at the
tokenizer boundary and dropped every later message plus the assistant
marker, with no log. Add an explicit text_len and thread it through,
matching llama_tokenize and the text only path.

• cleanup

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Co-authored-by: Xuan Son Nguyen [email protected]

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• UI