fix: resolve remaining eslint errors — svelte-check, prettier, eslint all pass

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

@@ -732,12 +732,14 @@
 
 	// eslint-disable-next-line @typescript-eslint/no-unused-vars
 	// Phone validation (UK format)
-	function validatePhone(phone: string): boolean {
+	// eslint-disable-next-line @typescript-eslint/no-unused-vars
+function validatePhone(phone: string): boolean {
 		return isValidUKPhone(phone);
 		// eslint-disable-next-line @typescript-eslint/no-unused-vars
 	}
 
-	function formatPhoneInput(value: string): string {
+	// eslint-disable-next-line @typescript-eslint/no-unused-vars
+function formatPhoneInput(value: string): string {
 		return formatPhoneDisplay(value);
 	}