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_documents.go

@@ -47,7 +47,7 @@ func (s *Server) handleCreateDocument(w http.ResponseWriter, r *http.Request) {
 	var req struct {
 		SpaceID    string                 `json:"spaceId"`
 		Title      string                 `json:"title"`
-		Icon       string                 `json:"icon"`
+		Icon       *string                `json:"icon"` // "" = no icon; missing = the default
 		FolderPath string                 `json:"folderPath"`
 		Blocks     []domain.DocumentBlock `json:"blocks"`
 		Tags       []string               `json:"tags"`
@@ -58,7 +58,12 @@ func (s *Server) handleCreateDocument(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	doc, err := s.store.CreateDocument(userID, req.SpaceID, req.Title, req.Icon, req.FolderPath, req.Blocks, req.Tags, req.IsPinned)
+	doc, err := s.store.CreateDocument(userID, req.SpaceID, req.Title, derefIcon(req.Icon), req.FolderPath, req.Blocks, req.Tags, req.IsPinned)
+	if err == nil && doc != nil && req.Icon != nil && *req.Icon == "" {
+		if err = s.store.ClearIcon("documents", doc.ID); err == nil {
+			doc.Icon = ""
+		}
+	}
 	if err != nil {
 		writeError(w, http.StatusBadRequest, err.Error())
 		return
@@ -330,3 +335,11 @@ func (s *Server) docTitle(userID, docID string) string {
 	}
 	return "Unbenannte Notiz"
 }
+
+// derefIcon: the icon of a create request; a missing one lets the store pick the default.
+func derefIcon(icon *string) string {
+	if icon == nil {
+		return ""
+	}
+	return *icon
+}