Add Onboarding Tour for New Users

[Divineifed1]

Component: components/onboarding-tour.jsx
Type: UX
Priority: Medium

Description:
Implement a guided tour for first-time users to introduce them to the key features of the platform, such as creating ideas and voting.

Tasks:

• Choose and integrate a tour library (e.g., Shepherd.js, Intro.js).
• Define the steps of the tour, highlighting key UI elements.
• Trigger the tour automatically for new users and allow them to skip or restart it.

Acceptance Criteria:

• The tour successfully guides users through the main features.
• User progress through the tour is saved.
• The tour is dismissible and not intrusive.