feat(recipes): filter ingredients with quantity <= 0 before API submission

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/routes/(app)/recipes/[id]/edit/+page.server.ts

@@ -77,10 +77,10 @@ export const actions: Actions = {
 				effort,
 				heroImageUrl,
 				ingredients: (parsedIngredients as { name: string; quantity: string; unit: string }[])
-					.filter((ing) => ing.name?.trim())
+					.filter((ing) => ing.name?.trim() && Number(ing.quantity) > 0)
 					.map((ing, i) => ({
 						newIngredientName: ing.name.trim(),
-						quantity: Number(ing.quantity) || 0,
+						quantity: Number(ing.quantity),
 						unit: ing.unit || '',
 						sortOrder: i
 					})),