feat(org): add celebration confetti when joining or creating organization

Add a celebratory experience when users join or create an organization:
- Add canvas-confetti dependency for visual effects
- Store organization name in localStorage after successful join/create
- Display celebration dialog with confetti animation on ProfilePage
- Clear the celebration flag after showing to prevent repeat displays

package.json

@@ -40,6 +40,7 @@
     "@radix-ui/react-toggle-group": "^1.1.10",
     "@radix-ui/react-tooltip": "^1.2.7",
     "@tanstack/react-query": "^5.83.0",
+    "canvas-confetti": "^1.9.4",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
     "cmdk": "^1.1.1",