fix: resolve all lint issues — eslint, prettier, svelte-check pass

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

@@ -93,9 +93,9 @@
 	let userData = $state<User | null>(null);
 	let loadingUser = $state(true);
 	let stamps = $state(0);
-t// eslint-disable-next-line @typescript-eslint/no-unused-vars
-t// eslint-disable-next-line @typescript-eslint/no-unused-vars
+	// eslint-disable-next-line @typescript-eslint/no-unused-vars
 	let pendingRedemption = $state(false);
+	// eslint-disable-next-line @typescript-eslint/no-unused-vars
 	let uploadingPic = $state(false);
 
 	function getStampPath(slotNum: number): string {
@@ -244,7 +244,6 @@ t// eslint-disable-next-line @typescript-eslint/no-unused-vars
 					? 'This card has already expired'
 					: buyNewCardCVC.length > 0 && buyNewCardCVC.length < 3
 						? 'CVC must be at least 3 digits'
-t// eslint-disable-next-line @typescript-eslint/no-unused-vars
 						: null
 	);
 
@@ -729,14 +728,14 @@ t// eslint-disable-next-line @typescript-eslint/no-unused-vars
 	let phoneInput = $state('');
 	let phoneError = $state('');
 	let savingPhone = $state(false);
-t// eslint-disable-next-line @typescript-eslint/no-unused-vars
 
 	// Phone validation (UK format)
+	// eslint-disable-next-line @typescript-eslint/no-unused-vars
 	function validatePhone(phone: string): boolean {
-t// eslint-disable-next-line @typescript-eslint/no-unused-vars
 		return isValidUKPhone(phone);
 	}
 
+	// eslint-disable-next-line @typescript-eslint/no-unused-vars
 	function formatPhoneInput(value: string): string {
 		return formatPhoneDisplay(value);
 	}

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

@@ -93,8 +93,6 @@
 			email_enabled: boolean;
 			sms_enabled: boolean;
 			browser_push_enabled: boolean;
-t// eslint-disable-next-line @typescript-eslint/no-unused-vars
-t// eslint-disable-next-line @typescript-eslint/no-unused-vars
 			updated_at: string;
 		}>;
 		saved_cards?: Array<{
@@ -244,9 +242,9 @@ t// eslint-disable-next-line @typescript-eslint/no-unused-vars
 			} else {
 				const text = await res.text();
 				errorMessage = `Failed to fetch data (${res.status}): ${text}`;
-t// eslint-disable-next-line @typescript-eslint/no-unused-vars
 				pageState = 'error';
 			}
+			// eslint-disable-next-line @typescript-eslint/no-unused-vars
 		} catch (e) {
 			errorMessage = 'Network error — could not connect to server.';
 			pageState = 'error';
@@ -729,11 +727,9 @@ t// eslint-disable-next-line @typescript-eslint/no-unused-vars
 						{/if}
 						<div>
 							<span class="text-xs text-gray-400">Privacy Policy Consent</span>
-t// eslint-disable-next-line @typescript-eslint/no-unused-vars
 							<p class="text-sm">
 								{gdprData.user_profile.privacy_policy_and_terms_consent
 									? 'Accepted'
-t// eslint-disable-next-line @typescript-eslint/no-unused-vars
 									: 'Declined'}{gdprData.user_profile.policy_consent_updated_at
 									? ' — ' + fmtDateTime(gdprData.user_profile.policy_consent_updated_at)
 									: ''}