feat: enhance project management with duplicate name checks and toast notifications

- Added duplicate name check in NewProjectDialog to warn users of existing project names.
- Integrated toast notifications for actions like project deletion and export in ProjectsPage.
- Implemented project ordering and restoration functionality in platform context.
- Updated ProjectsPage to include search, sorting, and pagination features.
- Created a new Toast component for displaying notifications with optional undo actions.
- Refactored main application entry to include ToastProvider for global toast management.

frontend/src/main.tsx

@@ -2,6 +2,7 @@ import React from 'react'
 import { createRoot } from 'react-dom/client'
 import { BrowserRouter, Navigate, Route, Routes } from 'react-router-dom'
 import { ThemeProvider } from './lib/themeContext'
+import { ToastProvider } from './components/ui/toast'
 import { registerBuiltinNodes } from './lib/registerBuiltinNodes'
 import { PlatformPage } from './app/platform/PlatformPage'
 import { ProjectsPage } from './app/platform/ProjectsPage'
@@ -14,15 +15,17 @@ registerBuiltinNodes()
 createRoot(document.getElementById('root')!).render(
   <React.StrictMode>
     <ThemeProvider>
-      <BrowserRouter>
-        <Routes>
-          <Route path="/" element={<PlatformPage />}>
-            <Route index element={<Navigate to="/projects" replace />} />
-            <Route path="projects" element={<ProjectsPage />} />
-            <Route path="projects/:projectId" element={<CanvasRoute />} />
-          </Route>
-        </Routes>
-      </BrowserRouter>
+      <ToastProvider>
+        <BrowserRouter>
+          <Routes>
+            <Route path="/" element={<PlatformPage />}>
+              <Route index element={<Navigate to="/projects" replace />} />
+              <Route path="projects" element={<ProjectsPage />} />
+              <Route path="projects/:projectId" element={<CanvasRoute />} />
+            </Route>
+          </Routes>
+        </BrowserRouter>
+      </ToastProvider>
     </ThemeProvider>
   </React.StrictMode>
 )