feat(frontend): add FloatingActionButton with expandable quick actions

[dDevAhmed]

Summary

Implemented a global Floating Action Button for quick access actions.

What was added

• Added a reusable FloatingActionButton component:
  • Fixed bottom-right placement
  • Optional expandable quick actions list
  • Smooth open/close animation and icon rotation
• Wired FAB into the root app layout so it is available across pages.

Files

• FloatingActionButton.tsx
• layout.tsx

Acceptance Criteria

• Fixed position
• Expandable actions (optional)
• Smooth animation

Validation

• Ran frontend production build after integration and compatibility fixes.
• Build now completes successfully in this branch.

closes #375