fix: restore admin lunch warning tier (30-60min) with gap-worsening comparison

frontend/src/lib/lunchProtection.ts

@@ -217,15 +217,29 @@ export function getLunchProtectionForSlots(
 					showWarning: false,
 					warningMessage: 'This booking would leave no lunch break (minimum 30 minutes required).'
 				});
+			} else if (gapWith < 60) {
+				const gapsWithout = findAllLunchGaps(windowStart, windowEnd, existingBookings);
+				const gapWithout = gapsWithout[0] ?? 0;
+				if (gapWith < gapWithout) {
+					results.set(slotStartStr, {
+						isBlocked: false,
+						showWarning: true,
+						warningMessage: `This booking would reduce lunch break to ${gapWith} minutes.`
+					});
+				}
 			}
 		} else {
 			if (gapWith < 60) {
-				results.set(slotStartStr, {
-					isBlocked: true,
-					showWarning: false,
-					warningMessage:
-						'This booking would leave insufficient lunch break (minimum 1 hour required).'
-				});
+				const gapsWithout = findAllLunchGaps(windowStart, windowEnd, existingBookings);
+				const gapWithout = gapsWithout[0] ?? 0;
+				if (gapWith < gapWithout) {
+					results.set(slotStartStr, {
+						isBlocked: true,
+						showWarning: false,
+						warningMessage:
+							'This booking would leave insufficient lunch break (minimum 1 hour required).'
+					});
+				}
 			}
 		}
 	}