Refactor UI components for layout management and results display

- Replaced the `renderizar` function in `layouts.rs` with a new `view` function using Iced for a more modern UI approach.
- Introduced a new `view_secao_layouts` function to handle the display of saved layouts.
- Updated the `resultado.rs` file to use Iced for rendering the results screen, including buttons for actions and pagination controls.
- Created a new `selecionar_aba.rs` file for the selection of XLSX sheet tabs, implementing a preview feature.
- Removed old rendering functions and replaced them with Iced components for better performance and maintainability.
- Added design tokens in `design_tokens.json` for consistent styling across the application.
- Created a mockup HTML file to visualize the UI design.

src/ui/components/mod.rs

@@ -0,0 +1,3 @@
+pub mod modal;
+pub mod paginacao;
+pub mod tabela_preview;