FAB Button Redesign (FAB_Overlay)

The Floating Action Buttons (FABs) used in `FAB_Overlay` are currently inconsistent in style, size, and visual language.

This issue focuses on redesigning all FAB buttons to achieve a cleaner, more modern, and consistent appearance.

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## Goal

Create a unified FAB design system that:

* Is visually consistent across all FABs
* Matches the overall visual language of the application
* Improves clarity and usability

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## Scope

### Design Tasks

Redesign all FAB buttons used in:

* `FAB_Overlay`
* Contextual and secondary FABs
* Expanded or multi-action FAB states
* FAB icons (if applicable)

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## Design Guidelines

* Clean, modern, technical look
* Consistent size, shape, elevation, and spacing
* Clear visual hierarchy (primary vs. secondary actions)
* Icons must remain readable at small sizes
* Follow Material Design principles where applicable

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## Integration

* Developers will assist with implementation
* Design should be reusable across the application
* Provide assets, specifications, or mockups suitable for Android UI

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## Acceptance Criteria

* All FABs follow a single, consistent design language
* Clear distinction between primary and secondary actions
* Improved visual clarity and usability
* Design ready for implementation