Allow deleting projects from the project picker with x/X.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/config/config.go

@@ -80,3 +80,11 @@ func (c *Config) SetActiveBoardLists(projectID, listIDs string) {
 	}
 	c.ProjectLists[projectID] = listIDs
 }
+
+// ClearProjectLists removes the persisted board filter for a project.
+func (c *Config) ClearProjectLists(projectID string) {
+	if c.ProjectLists == nil {
+		return
+	}
+	delete(c.ProjectLists, projectID)
+}