Refactor/nutrition meals components

[pankaj-basnet]

Summary

This PR refactors widgets/nutrition/meal.dart
(MealWidget), extract large inline sections into named sub-components.

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Issue/Problem

_MealWidgetState.build() was ~160 lines long, with deeply nested if
blocks for the editing toolbar, divider, ingredient list, total row, and diary section.
Reading and modifying this method required tracking all four ViewMode conditions
simultaneously.

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Changes

providers/nutrition_notifier.dart
  └── NutritionState.recentMealItemsInPlan()  [NEW METHOD]

widgets/nutrition/meal.dart
  ├── enum viewMode → ViewMode            [NAMING FIX]
  ├── MealWidget constructor              
  │    removed: List<MealItem> _recentMealItems
  ├── MealIngredientsSection              [NEW ConsumerWidget]
  │    extracted: dividers, DiaryheaderTile, ingredient list, total row
  └── MealEditingToolbar                  [NEW ConsumerWidget]
       self-serves recentMealItems via ref.watch(nutritionProvider)

widgets/nutrition/nutritional_plan_detail.dart
  └── MealWidget call-sites               [CALL-SITE CLEANED]
       removed: _nutritionalPlan.dedupMealItems argument (×2)

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Files Changed

#	File	Change Type
1	lib/providers/nutrition_notifier.dart	Added recentMealItemsInPlan() to NutritionState
2	lib/widgets/nutrition/meal.dart	Refactor — extracted 2 sub-widgets
3	lib/widgets/nutrition/nutritional_plan_detail.dart	Updated 2 MealWidget call-sites

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Testing

• refactored meal_test.dart

Please check that the PR fulfills these requirements

• Tests for the changes have been added (for bug fixes / features)
• Set a 100-character limit to avoid white space diffs (run dart format .)

[rolandgeider]

Now that we have merged the offiline mode, we can finally start working on simpler stuff like this! :)

[pankaj-basnet]

YEAH! refactoring this meal.dart file was in my todo list for few weeks now