Preliminary fix in rune mode for remapping

Based on sveltejs/svelte#15107 (comment)

Author: ltctceplrm

src/settings/PropertyMappingModelComponent.svelte

@@ -3,18 +3,23 @@
 	import { capitalizeFirstLetter } from '../utils/Utils';
 	import Icon from './Icon.svelte';
 
-	export let model: PropertyMappingModel;
-	export let save: (model: PropertyMappingModel) => void;
+	interface Props {
+		model: PropertyMappingModel;
+		save: (model: PropertyMappingModel) => void;
+	}
 
-	let validationResult: { res: boolean; err?: Error } | undefined;
+	let { model, save }: Props = $props();
 
-	$: validationResult = model.validate();
+	let validationResult: { res: boolean; err?: Error } | undefined = $derived(model.validate());
+
+	// Use $state as a variable declaration initializer
+	let propertyStates = $state(model.properties.map(p => ({ ...p })));
 </script>
 
 <div class="media-db-plugin-property-mappings-model-container">
 	<div class="setting-item-name">{capitalizeFirstLetter(model.type)}</div>
 	<div class="media-db-plugin-property-mappings-container">
-		{#each model.properties as property}
+		{#each propertyStates as property, i}
 			<div class="media-db-plugin-property-mapping-element">
 				<div class="media-db-plugin-property-mapping-element-property-name-wrapper">
 					<pre class="media-db-plugin-property-mapping-element-property-name"><code>{property.property}</code></pre>
@@ -48,6 +53,10 @@
 	<button
 		class="media-db-plugin-property-mappings-save-button {validationResult?.res ? 'mod-cta' : 'mod-muted'}"
 		onclick={() => {
+			// Sync propertyStates back to model.properties
+			model.properties.forEach((p, i) => {
+				Object.assign(p, propertyStates[i]);
+			});
 			if (model.validate().res) save(model);
 		}}
 		>Save

src/settings/PropertyMappingModelsComponent.svelte

@@ -2,8 +2,12 @@
 	import { PropertyMappingModel } from './PropertyMapping';
 	import PropertyMappingModelComponent from './PropertyMappingModelComponent.svelte';
 
-	export let models: PropertyMappingModel[] = [];
-	export let save: (model: PropertyMappingModel) => void;
+	interface Props {
+		models?: PropertyMappingModel[];
+		save: (model: PropertyMappingModel) => void;
+	}
+
+	let { models = [], save }: Props = $props();
 </script>
 
 <div class="setting-item" style="display: flex; gap: 10px; flex-direction: column; align-items: stretch;">