feat(onboarding): implement multi-step user onboarding registration w…

[Jess52487]

Pull Request Description

closes #473

Title: feat(onboarding): implement multi-step user onboarding registration wizard

Description

This PR implements a comprehensive, accessible, and high-fidelity registration system for the User Onboarding flow in TeachLink. It utilizes the custom multi-step FormWizardController to guide newly registered users through establishing their profile parameters.

Key Changes

• Redirection Logic: Updated the signup success hook in [page.tsx]
• Form Component Exports: Properly exported core wizard and builder components from the [index.ts]
• Core Fixes: Patched [FormWizardController.tsx]
• CSS Styling: Extended [globals.css]
• User Onboarding Page (/onboarding):
  • Step 1 (Personal & Role): Collects username, role selection (Student vs. Instructor), date of birth, and bio.
  • Step 2 (Preferences): Configures technical interests (Web3, Frontend, DevOps), notification channels, language, and newsletter preferences.
  • Step 3 (Web3 Wallet): Features an interactive Starknet Wallet connector for Argent X and Braavos wallets, which mocks connection states, generates contract addresses, and manages active/disconnection statuses.
• Test Suite: Added unit and integration tests under [onboarding.test.tsx]

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