feat: complete Svelte 5 migration across entire application

Migrated all components and routes from Svelte 4 to Svelte 5 syntax:

- Converted export let → $props() with generic type syntax
- Replaced createEventDispatcher → callback props
- Migrated $: reactive statements → $derived() and $effect()
- Updated two-way bindings with $bindable()
- Fixed TypeScript syntax: added lang="ts" to script tags
- Converted inline type annotations to generic parameter syntax

- Updated deprecated event directives to Svelte 5 syntax:
  - on:click → onclick
  - on:submit → onsubmit
  - on:change → onchange

- Converted deprecated <slot> elements → {@render children()}
- Updated slot props to Snippet types
- Fixed season/icon selector components with {#snippet} blocks

- Fixed non-reactive state by converting let → $state()
- Fixed infinite loop in EnhancedBalance by converting $effect → $derived
- Fixed Chart.js integration by converting $state proxies to plain arrays
- Updated cospend dashboard and payment pages with proper reactivity

- Migrated 20+ route files from export let data → $props()
- Fixed TypeScript type annotations in page components
- Updated reactive statements in error and cospend routes

- Removed invalid onchange attribute from Toggle component
- Fixed modal ID isolation in CreateIngredientList/CreateStepList
- Fixed dark mode button visibility in TranslationApproval
- Build now succeeds with zero deprecation warnings

All functionality tested and working. No breaking changes to user experience.

src/lib/components/prayers/Angelus.svelte

@@ -0,0 +1,88 @@
+<script>
+	import Prayer from './Prayer.svelte';
+	import AveMaria from './AveMaria.svelte';
+</script>
+
+<Prayer>
+	<!-- First Versicle and Response -->
+	<p>
+		<v lang="la"><i>℣.</i> Angelus Domini nuntiavit Mariae.</v>
+		<v lang="de"><i>℣.</i> Der Engel des Herrn brachte Maria die Botschaft</v>
+		<v lang="en"><i>℣.</i> The Angel of the Lord declared unto Mary.</v>
+		<v lang="la"><i>℟.</i> Et concepit de Spiritu Sancto.</v>
+		<v lang="de"><i>℟.</i> und sie empfing vom Heiligen Geist.</v>
+		<v lang="en"><i>℟.</i> And she conceived of the Holy Spirit.</v>
+	</p>
+</Prayer>
+
+<!-- First Hail Mary -->
+<AveMaria />
+
+<Prayer>
+	<!-- Second Versicle and Response -->
+	<p>
+		<v lang="la"><i>℣.</i> Ecce ancilla Domini,</v>
+		<v lang="de"><i>℣.</i> Maria sprach: Siehe, ich bin die Magd des Herrn</v>
+		<v lang="en"><i>℣.</i> Behold the handmaid of the Lord.</v>
+		<v lang="la"><i>℟.</i> Fiat mihi secundum verbum tuum.</v>
+		<v lang="de"><i>℟.</i> mir geschehe nach Deinem Wort.</v>
+		<v lang="en"><i>℟.</i> Be it done unto me according to thy word.</v>
+	</p>
+</Prayer>
+
+<!-- Second Hail Mary -->
+<AveMaria />
+
+<Prayer>
+	<!-- Third Versicle and Response -->
+	<p>
+		<v lang="la"><i>℣.</i> Et Verbum caro factum est,</v>
+		<v lang="de"><i>℣.</i> Und das Wort ist Fleisch geworden</v>
+		<v lang="en"><i>℣.</i> And the Word was made flesh.</v>
+		<v lang="la"><i>℟.</i> Et habitavit in nobis.</v>
+		<v lang="de"><i>℟.</i> und hat unter uns gewohnt.</v>
+		<v lang="en"><i>℟.</i> And dwelt among us.</v>
+	</p>
+</Prayer>
+
+<!-- Third Hail Mary -->
+<AveMaria />
+
+<Prayer>
+	<!-- Fourth Versicle and Response -->
+	<p>
+		<v lang="la"><i>℣.</i> Ora pro nobis, sancta Dei Genetrix,</v>
+		<v lang="de"><i>℣.</i> Bitte für uns Heilige Gottesmutter</v>
+		<v lang="en"><i>℣.</i> Pray for us, O holy Mother of God.</v>
+		<v lang="la"><i>℟.</i> Ut digni efficiamur promissionibus Christi.</v>
+		<v lang="de"><i>℟.</i> auf dass wir würdig werden der Verheißungen Christi.</v>
+		<v lang="en"><i>℟.</i> That we may be made worthy of the promises of Christ.</v>
+	</p>
+
+	<!-- Closing Prayer -->
+	<p>
+		<v lang="la"><i>℣.</i> Oremus.</v>
+		<v lang="de"><i>℣.</i> Lasset uns beten.</v>
+		<v lang="en"><i>℣.</i> Let us pray:</v>
+	</p>
+
+	<p>
+		<v lang="la">
+			Gratiam tuam, quaesumus, Domine, mentibus nostris infunde; ut qui, Angelo nuntiante,
+			Christi Filii tui incarnationem cognovimus, per passionem eius et crucem ad
+			resurrectionis gloriam perducamur. Per eumdem Christum Dominum nostrum. Amen.
+		</v>
+		<v lang="de">
+			Allmächtiger Gott, gieße deine Gnade in unsere Herzen ein. Durch die Botschaft des
+			Engels haben wir die Menschwerdung Christi, deines Sohnes, erkannt. Lass uns durch
+			sein Leiden und Kreuz zur Herrlichkeit der Auferstehung gelangen. Darum bitten wir
+			durch Christus, unseren Herrn. Amen.
+		</v>
+		<v lang="en">
+			Pour forth, we beseech Thee, O Lord, Thy grace into our hearts, that we to whom the
+			Incarnation of Christ Thy Son was made known by the message of an angel, may by His
+			Passion and Cross be brought to the glory of His Resurrection. Through the same Christ
+			Our Lord. Amen.
+		</v>
+	</p>
+</Prayer>

src/lib/components/prayers/AveMaria.svelte

@@ -1,8 +1,7 @@
-<script>
+<script lang="ts">
 	import Prayer from './Prayer.svelte';
 
-	export let mystery = ""; // For rosary mysteries (German)
-	export let mysteryLatin = ""; // For rosary mysteries (Latin)
+	let { mystery = "", mysteryLatin = "" } = $props<{ mystery?: string, mysteryLatin?: string }>();
 </script>
 
 <Prayer>

src/lib/components/prayers/Prayer.svelte

@@ -1,7 +1,8 @@
-<script>
+<script lang="ts">
+	import type { Snippet } from 'svelte';
 	import { getLanguageContext } from '$lib/contexts/languageContext.js';
 
-	export let latinPrimary = true; // Controls which language is shown prominently
+	let { latinPrimary = true, children } = $props<{ latinPrimary?: boolean, children?: Snippet }>();
 
 	// Get context if available (graceful fallback for standalone usage)
 	let showLatinStore;
@@ -12,7 +13,7 @@
 		showLatinStore = null;
 	}
 
-	$: showLatin = showLatinStore ? $showLatinStore : true;
+	let showLatin = $derived(showLatinStore ? $showLatinStore : true);
 </script>
 
 <style>
@@ -123,5 +124,5 @@
 </style>
 
 <div class="prayer-wrapper" class:german-primary={!latinPrimary} class:monolingual={!showLatin}>
-	<slot></slot>
+	{@render children?.()}
 </div>