Add yeast type swapper with intelligent unit conversion

- Implements swap button for Frischhefe/Trockenhefe ingredients
- Supports 3:1 fresh-to-dry yeast conversion ratio
- Handles special Prise unit conversions (1 Prise = 1 Prise or 1g)
- Accounts for recipe multipliers (0.5x, 1x, 1.5x, 2x, 3x, custom)
- Automatic unit switching between grams and Prise for practical cooking

🤖 Generated with [Claude Code](https://claude.ai/code)

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

src/lib/components/HefeSwapper.svelte

@@ -1,18 +1,50 @@
 <script>
-	// get ingredients_store from IngredientsPage.svelte
+	import { createEventDispatcher } from 'svelte';
-	import ingredients_store from './IngredientsPage.svelte';
+	
-	let ingredients = [];
+	export let item;
-	ingredients_store.subscribe(value => {
+	export let multiplier = 1;
-		ingredients = value;
+	
-	});
+	const dispatch = createEventDispatcher();
-	function toggleHefe(){
+	
-		if(data.ingredients[i].list[j].name == "Frischhefe"){
+	function toggleHefe() {
-			data.ingredients[i].list[j].name = "Trockenhefe"
+		let newName, newAmount, newUnit = item.unit;
-			data.ingredients[i].list[j].amount = item.amount / 3
+		
+		if (item.name === "Frischhefe") {
+			// Convert fresh yeast to dry yeast
+			const originalAmount = parseFloat(item.amount) / multiplier;
+			newName = "Trockenhefe";
+			
+			if (item.unit === "Prise") {
+				// "1 Prise Frischhefe" → "1 Prise Trockenhefe"
+				newAmount = item.amount;
+				newUnit = "Prise";
+			} else if (item.unit === "g" && originalAmount === 1) {
+				// "1 g Frischhefe" → "1 Prise Trockenhefe"
+				newAmount = "1";
+				newUnit = "Prise";
+			} else {
+				// Normal conversion: "9 g Frischhefe" → "3 g Trockenhefe" (divide by 3)
+				newAmount = (originalAmount / 3).toString();
+				newUnit = "g";
+			}
+		} else if (item.name === "Trockenhefe") {
+			// Convert dry yeast to fresh yeast
+			const originalAmount = parseFloat(item.amount) / multiplier;
+			newName = "Frischhefe";
+			
+			if (item.unit === "Prise") {
+				// "1 Prise Trockenhefe" → "1 g Frischhefe"
+				newAmount = "1";
+				newUnit = "g";
+			} else {
+				// Normal conversion: "1 g Trockenhefe" → "3 g Frischhefe" (multiply by 3)
+				newAmount = (originalAmount * 3).toString();
+				newUnit = "g";
+			}
 		}
-		else{
+		
-			item.name = "Frischhefe"
+		if (newName && newAmount) {
-			item.amount = item.amount * 3
+			dispatch('toggle', { name: newName, amount: newAmount, unit: newUnit });
 		}
 	}
 </script>
@@ -28,7 +60,6 @@
 		fill: var(--blue);
 	}
 </style>
-<button onclick={toggleHefe}>
+<button on:click={toggleHefe} title="Zwischen Frischhefe und Trockenhefe wechseln">
-	{item.amount} {item.unit} {item.name}
 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><!--!Font Awesome Free 6.6.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free Copyright 2024 Fonticons, Inc.--><path d="M105.1 202.6c7.7-21.8 20.2-42.3 37.8-59.8c62.5-62.5 163.8-62.5 226.3 0L386.3 160 352 160c-17.7 0-32 14.3-32 32s14.3 32 32 32l111.5 0c0 0 0 0 0 0l.4 0c17.7 0 32-14.3 32-32l0-112c0-17.7-14.3-32-32-32s-32 14.3-32 32l0 35.2L414.4 97.6c-87.5-87.5-229.3-87.5-316.8 0C73.2 122 55.6 150.7 44.8 181.4c-5.9 16.7 2.9 34.9 19.5 40.8s34.9-2.9 40.8-19.5zM39 289.3c-5 1.5-9.8 4.2-13.7 8.2c-4 4-6.7 8.8-8.1 14c-.3 1.2-.6 2.5-.8 3.8c-.3 1.7-.4 3.4-.4 5.1L16 432c0 17.7 14.3 32 32 32s32-14.3 32-32l0-35.1 17.6 17.5c0 0 0 0 0 0c87.5 87.4 229.3 87.4 316.7 0c24.4-24.4 42.1-53.1 52.9-83.8c5.9-16.7-2.9-34.9-19.5-40.8s-34.9 2.9-40.8 19.5c-7.7 21.8-20.2 42.3-37.8 59.8c-62.5 62.5-163.8 62.5-226.3 0l-.1-.1L125.6 352l34.4 0c17.7 0 32-14.3 32-32s-14.3-32-32-32L48.4 288c-1.6 0-3.2 .1-4.8 .3s-3.1 .5-4.6 1z"/></svg>
 </button>

src/lib/components/IngredientsPage.svelte

@@ -1,6 +1,7 @@
 <script>
 import { onMount } from 'svelte';
 import { onNavigate } from "$app/navigation";
+import HefeSwapper from './HefeSwapper.svelte';
 export let data
 let multiplier;
 let custom_mul = "…"
@@ -119,6 +120,15 @@ function apply_if_not_NaN(custom){
 		custom_mul = "…"
 	}
 }
+
+function handleHefeToggle(event, item) {
+	item.name = event.detail.name;
+	item.amount = event.detail.amount;
+	if (event.detail.unit) {
+		item.unit = event.detail.unit;
+	}
+	data = data; // Trigger reactivity
+}
 </script>
 <style>
 *{
@@ -232,7 +242,13 @@ span
 {/if}
 <div class=ingredients_grid>
 	{#each list.list as item}
-		<div class=amount>{@html adjust_amount(item.amount, multiplier)} {item.unit}</div><div class=name>{@html item.name.replace("{{multiplier}}", multiplier * item.amount)}</div>
+		<div class=amount>{@html adjust_amount(item.amount, multiplier)} {item.unit}</div>
+		<div class=name>
+			{@html item.name.replace("{{multiplier}}", multiplier * item.amount)}
+			{#if item.name === "Frischhefe" || item.name === "Trockenhefe"}
+				<HefeSwapper {item} {multiplier} on:toggle={(event) => handleHefeToggle(event, item)} />
+			{/if}
+		</div>
 	{/each}
 </div>
 {/each}