some more improvements

src/lib/DamageCalculator.svelte

@@ -33,8 +33,8 @@
   let total_min_damage_percentage = 0;
   let item_magnification = 1.0;
   function calculate_damage() {
-    let attacker;
-    let defender;
+    let attacker: PokemonStatus;
+    let defender: PokemonStatus;
     let atk_value;
     let def_value;
     if (
@@ -56,11 +56,11 @@
     }
     // 物理or特殊の判定
     if (attackData.category === 1) {
-      atk_value = attacker.atk;
-      def_value = defender.def;
+      atk_value = attacker.attack;
+      def_value = defender.defense;
     } else {
-      atk_value = attacker.spatk;
-      def_value = defender.spdef;
+      atk_value = attacker.special_attack;
+      def_value = defender.special_defense;
     }
 
     // debug