Extends the send_exec_approval embed-invisibility fix to its three
sibling prompt surfaces — send_slash_confirm, send_clarify, and
send_update_prompt — via a shared _self_contained_prompt_content()
helper. All four interactive views now carry their payload in plain
content next to the buttons; the embed stays as progressive
enhancement for clients that render it. Adds gold to the conftest
discord Color mock (update prompt is the only gold user).
teknium1
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