Refactor toast notifications and modal dialog implementation

- Updated SCSS for toast notifications to support multiple toast types (success, info, warning, error) and improved layout.
- Added new SVG icons for error, info, success, and warning notifications.
- Created separate HTML templates for toast notifications and modal dialogs.
- Enhanced the dev panel with buttons to test different toast notifications and modal dialogs.

frontend/src/pages/recipe_view.rs

@@ -52,7 +52,7 @@ pub fn setup_page(recipe_id: i64, is_user_logged: bool, first_day_of_the_week: W
                     .shedule_recipe(recipe_id, date, servings, add_ingredients_to_shopping_list)
                     .await
                 {
-                    toast::show_element_and_initialize(
+                    toast::show_element_level_and_initialize(
                         match result {
                             ScheduleRecipeResult::Ok => Level::Success,
                             ScheduleRecipeResult::RecipeAlreadyScheduledAtThisDate => {