Add ability to create projects and copy tasks from templates

Adds functionality to create new projects, copying existing project tasks into the global task list. Includes a helper function to convert project-specific tasks to a general format and integrates this into the project creation process.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: ceced2fc-aa46-458d-ba87-ddd4b7bb1518
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/659922a9-0087-461c-90dd-6d9a58b81d4d/ceced2fc-aa46-458d-ba87-ddd4b7bb1518/P9UdTaE

client/src/App.tsx

@@ -194,6 +194,7 @@ function App() {
         return (
           <ProjectTemplate 
             onCreateFromTemplate={handleCreateFromTemplate}
+            onCreateTasks={(newTasks) => setTasks(prev => [...prev, ...newTasks])}
           />
         );