feat: add Workshop Organization to Sidebar Navigation

[dominiccreates]

this pr closes #474 Implemented the missing Workshop Organization in the sidebar navigation.

Changes

• Created src/components/navigation/SidebarNavigation.tsx
  • New navigation component featuring the required “Workshops” link.
  • Utilizes lucide-react icons and active‑state styling.
  • Responsive, glass‑panel UI with dark‑mode support.
• Integrated SidebarNavigation into src/app/dashboard/page.tsx
  • Replaced previous static sidebar placeholder.
• Updated navigation items to include:
  • Home (/)
  • Courses (/courses)
  • Workshops (/workshops) – the core addition.
  • Profile (/profile)
• Added necessary imports and ensured client‑side rendering ('use client').

Why

The original sidebar lacked a dedicated “Workshops” section, which broke the expected user flow for accessing workshop content. This PR introduces a clean, reusable navigation component that aligns with the design system and improves overall UX.

Testing

• Manual UI verification on desktop and mobile viewports.
• Confirmed navigation links lead to the correct routes.
• No existing functionality was altered aside from the sidebar injection.

Documentation

• Updated component documentation comments (in‑file) describing props and behavior.
• No additional README changes required at this time.

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