fix: resolve inbox project creation bugs (#1018)

- Fix button text showing "Update Project" instead of "Create Project"
  by checking for project.uid/id instead of just project existence
- Remove duplicate success toast (ProjectModal already shows one)
- Update both local and global projects store after creation
  so new project appears in Projects view without refresh

Fixes #980

frontend/components/Inbox/InboxItems.tsx

@@ -328,7 +328,12 @@ const InboxItems: React.FC = () => {
     const handleSaveProject = async (project: Project) => {
         try {
             await createProject(project);
-            showSuccessToast(t('project.createSuccess'));
+
+            const updatedProjects = await fetchProjects();
+            setProjects(updatedProjects);
+
+            const { setProjects: setGlobalProjects } = useStore.getState().projectsStore;
+            setGlobalProjects(updatedProjects);
 
             if (currentConversionItemUid !== null) {
                 await handleProcessItem(currentConversionItemUid, false);

frontend/components/Project/ProjectModal.tsx

@@ -801,7 +801,7 @@ const ProjectModal: React.FC<ProjectModalProps> = ({
                                     className="px-4 py-2 bg-blue-600 text-white rounded-md hover:bg-blue-700 dark:bg-blue-500 dark:hover:bg-blue-600 focus:outline-none transition duration-150 ease-in-out text-sm"
                                     data-testid="project-save-button"
                                 >
-                                    {project
+                                    {project?.uid || project?.id
                                         ? t(
                                               'modals.updateProject',
                                               'Update Project'