Handle legacy 'context' attachments#16687

allozaur merged 2 commits intoggml-org:masterggml-org/llama.cpp:masterfrom

allozaur:16374-missing-pasted-content-attachment-from-legacy-webui-dataallozaur/llama.cpp:16374-missing-pasted-content-attachment-from-legacy-webui-dataCopy head branch name to clipboard