style: fix no-useless-escape — remove unnecessary backslashes in regex char classes

frontend/src/lib/components/ui/phone-input/PhoneInput.svelte

@@ -49,7 +49,7 @@
 	}
 
 	function normalizePhone(value: string): string {
-		let cleaned = value.replace(/[\s\-\(\)]/g, '');
+		let cleaned = value.replace(/[\s\-()]/g, '');
 		if (cleaned.startsWith('07')) {
 			cleaned = '+44' + cleaned.substring(1);
 		}

frontend/src/routes/account/+page.svelte

@@ -800,7 +800,7 @@
 	let savingName = $state(false);
 
 	// Name validation (unicode letters, spaces, hyphen, apostrophe, dot)
-	const nameRegex = /^[\p{L}\p{M}\s\-'\.]+$/u;
+	const nameRegex = /^[\p{L}\p{M}\s-'.]+$/u;
 
 	function startEditFirstName() {
 		firstNameInput = userData?.firstName || '';