"Compact mode", confusing "x button"

Especially when cards are open in "compact mode" (on the right, inside the sidebar) I feel that the layout gets confusing.

The X button on the card context means "close this card"

but the same X button on the notification panel dropdown means "delete this notification"

Very often I end up accidentally removing a notification and I then feel frustrated cause there is no way to get it back once you deleted it.

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Start by inspecting the compact-mode card and notification-panel dropdown shown in the issue screenshots. Trace both X-button actions and define a distinction that prevents accidental notification deletion while preserving card closing; verify that each control still performs the intended action.