feat: add Linear-style collapsible sidebar navigation

[rupeedev]

• Add SidebarContext for state management with localStorage persistence
• Create Sidebar component with collapsible sections:
  • Inbox and My Issues quick access
  • Workspace section (Members, Projects, Views)
  • Your projects section with project list
  • Try section (Import, Invite, Initiatives, Cycles, GitHub)
• Update NormalLayout to integrate sidebar alongside Navbar
• Add SidebarProvider to App.tsx
• Support collapsed mode with tooltips
• Active state highlighting for current project

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