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A failed intro used to clear the pin even though the chat was already made, so the next click opened a second one. A missing pin grabbed the newest session, even when a real Bot Chat was in the list. Failed intros now keep the pin. A missing pin looks for a session titled Bot Chat. If that is not there, we try the stored pin instead of the newest row. Ported from NousResearch/Hermes-Bot-Mode#59 after Bot Mode moved in-tree.