feat: integrate Firebase for authentication and data management, add GameItem type, and enhance UI with tooltips

src/types/GameItem.ts

@@ -0,0 +1,31 @@
+export interface GameItem {
+    id: number;
+    name: string;
+    type: ItemType;
+    rarity: ItemRarity;
+    description: string;
+    price: number;
+    effect: string;
+    equipTarget: ItemEquipTarget;
+}
+
+export enum ItemType {
+    Material = 'Material',
+    Consumable = 'Consumable',
+    Equipment = 'Equipment'
+}
+
+export enum ItemRarity {
+    Common = 'Common', // White
+    Uncommon = 'Uncommon', // Green
+    Rare = 'Rare', // Blue
+    Legendary = 'Legendary' // Purple
+}
+
+export enum ItemEquipTarget {
+    None = 'None',
+    Head = 'Head',
+    Body = 'Body',
+    Legs = 'Legs',
+    Weapon = 'Weapon'
+}