fix(ion-label): enable toggle functionality for checkbox, radio, and toggle for the demo app components.

Resolved an issue where pressing on the label did not toggle the associated components.
Added CSS to adjust the z-index of ion-label.

Author: ThanasisTz

demo-app/src/routes/components/Checkbox/+page.svelte

@@ -12,6 +12,13 @@
 	};
 </script>
 
+<style>
+	ion-label{
+		position: relative;
+		z-index: -10;
+	}
+</style>
+
 <svelte:head>
 	<title>Ionic Companion - Checkboxes</title>
 </svelte:head>

demo-app/src/routes/components/Radio/+page.svelte

@@ -7,6 +7,13 @@
 	};
 </script>
 
+<style>
+	ion-label{
+		position: relative;
+		z-index: -10;
+	}
+</style>
+
 <svelte:head>
 	<title>Ionic Companion - Radios</title>
 </svelte:head>

demo-app/src/routes/components/Toggle/+page.svelte

@@ -7,6 +7,13 @@
 	};
 </script>
 
+<style>
+	ion-label{
+		position: relative;
+		z-index: -10;
+	}
+</style>
+
 <IonPage>
 	<ion-header translucent={true}>
 		<ion-toolbar>