Add responsive recent activity timeline component

[dedukpe]

Closes #101

Summary:
Adds a reusable Recent Activity Timeline component for displaying user actions across the application.

Changes:

• Added vertical timeline component
• Added reusable ActivityItem component
• Added activity type indicators:
  • snippet creation
  • snippet updates
  • ownership changes

Features:

• Integrated activity logs API
• Added loading state
• Added empty state handling
• Added responsive layouts
• Added smooth transitions for new activities
• Supports realtime activity updates

UI:

• Matches existing design system
• Works across desktop, tablet, and mobile

Tests:

Added coverage for:

• Activity rendering
• Activity type display
• Loading state
• Empty state
• Update behavior

Validation:

• Component is reusable
• Existing functionality preserved
• Tests passing

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