feat: select text across bullets and delete it like a text editor; Ctrl+Z in tasks; notes and lists without emoji; custom done columns complete tasks

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/api/handlers_lists.go

@@ -39,7 +39,7 @@ func (s *Server) handleCreateList(w http.ResponseWriter, r *http.Request) {
 	userID := auth.GetUserID(r.Context())
 	var req struct {
 		Title    string `json:"title"`
-		Icon     string `json:"icon"`
+		Icon     *string `json:"icon"` // "" = no icon; missing = the default
 		ListType string `json:"listType"`
 	}
 	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
@@ -47,7 +47,12 @@ func (s *Server) handleCreateList(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	lst, err := s.store.CreateList(userID, req.Title, req.Icon, req.ListType)
+	lst, err := s.store.CreateList(userID, req.Title, derefIcon(req.Icon), req.ListType)
+	if err == nil && lst != nil && req.Icon != nil && *req.Icon == "" {
+		if err = s.store.ClearIcon("lists", lst.ID); err == nil {
+			lst.Icon = ""
+		}
+	}
 	if err != nil {
 		writeError(w, http.StatusBadRequest, err.Error())
 		return