[Bug] Fix Some Bugs in Temporary Chats and Ephemeral Mode

Bug: Temporary Chat - 'Regenerate Response' produced an error
Bug: Temporary Chat - apply emoji to message - error
Bug: If a user creates a few temporary chats, they see "Ephemeral Chats" in the sidebar
Bug: Temporary Chat doesn't close after a user opens the channel

UX/UI: Hide emoji in Temporary Chat
UX/UI: Hide emoji in Ephemeral mode
UX/UI: Hide create folder and create channel buttons in Ephemeral mode
UX/UI: Hide 'New Temporary Chat' button in Ephemeral mode
UX/UI: Hide Search/AI Reorganization in Ephemeral mode