feat: implement UI redesign for Comparador de Notas

- Introduced a new theme for the application based on dark navy aesthetics.
- Created design tokens for colors, spacings, and border radii.
- Developed a theme module in Rust to manage styles for various UI components.
- Updated multiple screens and components to align with the new design, including cards, buttons, badges, and progress bars.
- Enhanced user experience with improved layouts and visual elements across the application.

src/ui/components/paginacao.rs

@@ -1,6 +1,7 @@
 use crate::ui::message::Message;
+use crate::ui::theme as t;
 use iced::widget::{button, row, text};
-use iced::Element;
+use iced::{Alignment, Element};
 
 /// Renderiza controles de paginação reutilizáveis.
 pub fn controles_paginacao(
@@ -9,15 +10,22 @@ pub fn controles_paginacao(
     msg_anterior: Message,
     msg_proximo: Message,
 ) -> Element<'static, Message> {
-    let btn_anterior = button("◀").on_press_maybe((pagina_atual > 0).then_some(msg_anterior));
-    let btn_proximo =
-        button("▶").on_press_maybe((pagina_atual + 1 < total_paginas).then_some(msg_proximo));
+    let btn_anterior = button("◀")
+        .on_press_maybe((pagina_atual > 0).then_some(msg_anterior))
+        .style(t::btn_ghost);
+
+    let btn_proximo = button("▶")
+        .on_press_maybe((pagina_atual + 1 < total_paginas).then_some(msg_proximo))
+        .style(t::btn_ghost);
 
     row![
         btn_anterior,
-        text(format!("Página {} / {}", pagina_atual + 1, total_paginas)).size(13),
+        text(format!("Página {} / {}", pagina_atual + 1, total_paginas))
+            .size(13)
+            .color(t::TEXT_SECONDARY),
         btn_proximo,
     ]
     .spacing(8)
+    .align_y(Alignment::Center)
     .into()
 }