ui: remove reading progress slider from bottom panel

src/reader.rs

@@ -440,12 +440,6 @@ egui::ComboBox::from_id_salt("bg_type_selector")
                         "1/1".to_string()
                     };
                     ui.label(label);
-                    let mut progress = if total_pages > 0 {
-                        *current_page as f32 / total_pages as f32
-                    } else { 0.0 };
-                    if ui.add(egui::Slider::new(&mut progress, 0.0..=1.0).text("")).changed() && total_pages > 0 {
-                        *current_page = (progress * total_pages as f32).round() as usize;
-                    }
                 });
             });
         });