fix: add conflict re-check guard before saving holiday hours and time blockers

Re-check conflicts immediately before finalizing holiday hours and time blocker saves to prevent race conditions. Add Refresh button to conflict banners. Fix prettier formatting in login page.

frontend/src/lib/components/admin/HolidayHours.svelte

@@ -86,6 +86,11 @@
 		]
 	});
 
+	// =============== Conflict Resolution State ===============
+	let overlappingBookings = $state<OverlappingBooking[]>([]);
+	let checkingOverlap = $state(false);
+	let hasOverlap = $derived(overlappingBookings.length > 0);
+
 	const isFormValid = $derived(
 		exceptionDraft.name.trim() !== '' &&
 			exceptionDraft.weekStarts.length > 0 &&
@@ -120,11 +125,6 @@
 
 	const dayNames = ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'];
 
-	// =============== Conflict Resolution State ===============
-	let overlappingBookings = $state<OverlappingBooking[]>([]);
-	let checkingOverlap = $state(false);
-	let hasOverlap = $derived(overlappingBookings.length > 0);
-
 	async function checkConflictingBookings() {
 		if (exceptionDraft.weekStarts.length === 0) {
 			overlappingBookings = [];
@@ -241,8 +241,8 @@
 							}) => ({
 								id: h.id,
 								weekday: h.weekday,
-										start_time: h.startTime,
+								start_time: h.startTime,
-										end_time: h.endTime,
+								end_time: h.endTime,
 								is_open: h.isOpen
 							})
 						) || []
@@ -266,6 +266,13 @@
 			return;
 		}
 
+		// Re-check conflicts before finalizing (race condition guard)
+		await checkConflictingBookings();
+		if (overlappingBookings.length > 0) {
+			toast.error('New conflicting bookings found. Please resolve them first.');
+			return;
+		}
+
 		savingHours = true;
 		const loadingToast = toast.loading('Creating exception group...');
 
@@ -298,7 +305,9 @@
 				await fetchExceptionGroups();
 			} else {
 				const text = await response.text();
-				toast.error('Failed to create: ' + sanitizeText(extractErrorMessage(text)), { id: loadingToast });
+				toast.error('Failed to create: ' + sanitizeText(extractErrorMessage(text)), {
+					id: loadingToast
+				});
 			}
 		} catch (err) {
 			console.error('Error creating exception group:', err);
@@ -329,7 +338,9 @@
 				await fetchExceptionGroups();
 			} else {
 				const text = await response.text();
-				toast.error('Failed to delete: ' + sanitizeText(extractErrorMessage(text)), { id: loadingToast });
+				toast.error('Failed to delete: ' + sanitizeText(extractErrorMessage(text)), {
+					id: loadingToast
+				});
 			}
 		} catch (err) {
 			console.error('Error deleting exception group:', err);
@@ -697,7 +708,14 @@
 					fill="none"
 					viewBox="0 0 24 24"
 				>
-					<circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4" />
+					<circle
+						class="opacity-25"
+						cx="12"
+						cy="12"
+						r="10"
+						stroke="currentColor"
+						stroke-width="4"
+					/>
 					<path
 						class="opacity-75"
 						fill="currentColor"
@@ -729,6 +747,9 @@
 							? ''
 							: 's'} with the proposed hours
 					</span>
+					<Button variant="outline" size="sm" class="h-6 text-xs ml-auto" onclick={checkConflictingBookings}>
+						Refresh
+					</Button>
 				</div>
 				<div class="space-y-3">
 					{#each overlappingBookings as booking (booking.id)}

frontend/src/lib/components/admin/TimeBlockers.svelte

@@ -395,6 +395,14 @@
 		const end = new Date(endIso);
 		const durationMinutes = Math.round((end.getTime() - start.getTime()) / 60000);
 
+		// Re-check conflicts before finalizing (race condition guard)
+		await checkOverlappingBookings();
+		if (overlappingBookings.length > 0) {
+			toast.error('New conflicting bookings found. Please resolve them first.');
+			creating = false;
+			return;
+		}
+
 		creating = true;
 		const loadingToast = toast.loading('Creating time blocker...');
 
@@ -864,6 +872,9 @@
 								? ''
 								: 's'} with this slot
 						</span>
+						<Button variant="outline" size="sm" class="h-6 text-xs ml-auto" onclick={checkOverlappingBookings}>
+							Refresh
+						</Button>
 					</div>
 					<div class="space-y-3">
 						{#each overlappingBookings as booking (booking.id)}

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

@@ -256,7 +256,7 @@
 	const isFormComplete = $derived(
 		isLogin
 			? formData.email.trim().length > 0 && formData.password.length > 0
-			: (formData.firstName.trim() &&
+			: formData.firstName.trim() &&
 					formData.lastName.trim() &&
 					formData.phone &&
 					formData.dateOfBirth &&
@@ -270,7 +270,7 @@
 					agreedToPolicy &&
 					!validationErrors.email &&
 					!validationErrors.phone &&
-					!validationErrors.dateOfBirth)
+					!validationErrors.dateOfBirth
 	);
 </script>