webui: Improve copy to clipboard with text attachments#17969

allozaur merged 8 commits intoggml-org:masterggml-org/llama.cpp:masterfrom

allozaur:17834-copy-user-message-content-with-pasted-content-attachmentsallozaur/llama.cpp:17834-copy-user-message-content-with-pasted-content-attachmentsCopy head branch name to clipboard