Tighten battle bond save validation

src/game/state/battleSaveState.ts

@@ -162,6 +162,10 @@ function isNonNegativeFiniteNumber(value: unknown) {
   return typeof value === 'number' && Number.isFinite(value) && value >= 0;
 }
 
+function isNonNegativeInteger(value: unknown) {
+  return Number.isInteger(value) && Number(value) >= 0;
+}
+
 function isFiniteNumber(value: unknown) {
   return typeof value === 'number' && Number.isFinite(value);
 }
@@ -313,13 +317,22 @@ function isBondArray(value: unknown, options: BattleSaveValidationOptions) {
         Array.isArray(bond.unitIds) &&
         bond.unitIds.length === 2 &&
         bond.unitIds.every((unitId) => typeof unitId === 'string' && isKnownUnitId(unitId, options)) &&
-        isPositiveInteger(bond.level) &&
-        isNonNegativeFiniteNumber(bond.exp) &&
-        isNonNegativeFiniteNumber(bond.battleExp)
+        isValidBondProgress(bond.level, bond.exp) &&
+        isNonNegativeInteger(bond.battleExp)
     )
   );
 }
 
+function isValidBondProgress(level: unknown, exp: unknown) {
+  return (
+    isPositiveInteger(level) &&
+    Number(level) <= 100 &&
+    Number.isInteger(exp) &&
+    Number(exp) >= 0 &&
+    (Number(level) >= 100 ? Number(exp) <= 100 : Number(exp) < 100)
+  );
+}
+
 function isOptionalItemStockRecord(value: unknown, options: BattleSaveValidationOptions) {
   if (value === undefined) {
     return true;