Remove unnecessary FoodItem instantiation before Firestore persistence

[Copilot]

The addProduct method created a FoodItem object that was never persisted—only a separately constructed foodItemData map was written to Firestore. This caused unnecessary object allocation and obscured which data structure was actually being stored.

Changes

• Removed premature FoodItem instantiation before Firestore write
• Construct FoodItem only after successful persistence, using the generated document ID
• Use method parameters directly in appendToCsv call instead of referencing unused object

Before:

val foodItem = FoodItem(...)  // Created but never persisted
val foodItemData = mutableMapOf(...)  // This is what actually gets stored

firestore.collection("foodItems").add(foodItemData)
    .addOnSuccessListener { ref ->
        // Use foodItem.copy() to add the ID
        onSuccess(foodItem.copy(id = ref.id, daysDifference = daysDifference))
    }

After:

val foodItemData = mutableMapOf(...)  // Single source of truth for persistence

firestore.collection("foodItems").add(foodItemData)
    .addOnSuccessListener { ref ->
        val foodItem = FoodItem(id = ref.id, ...)  // Built from persisted values
        onSuccess(foodItem)
    }

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[Copilot]

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