Task 2: Equipment System - support 2-handed weapons, staves block offhand slot

src/lib/game/data/equipment.ts

@@ -15,6 +15,7 @@ export interface EquipmentType {
   description: string;
   baseDamage?: number;         // For swords
   baseCastSpeed?: number;      // For swords (higher = faster)
+  twoHanded?: boolean;         // If true, weapon occupies both main hand and offhand slots
 }
 
 // ─── Equipment Types Definition ─────────────────────────────────────────────
@@ -28,6 +29,7 @@ export const EQUIPMENT_TYPES: Record<string, EquipmentType> = {
     slot: 'mainHand',
     baseCapacity: 50,
     description: 'A simple wooden staff, basic but reliable for channeling mana.',
+    twoHanded: true,
   },
   apprenticeWand: {
     id: 'apprenticeWand',
@@ -44,6 +46,7 @@ export const EQUIPMENT_TYPES: Record<string, EquipmentType> = {
     slot: 'mainHand',
     baseCapacity: 65,
     description: 'A sturdy oak staff with decent mana capacity.',
+    twoHanded: true,
   },
   crystalWand: {
     id: 'crystalWand',
@@ -60,6 +63,7 @@ export const EQUIPMENT_TYPES: Record<string, EquipmentType> = {
     slot: 'mainHand',
     baseCapacity: 80,
     description: 'A staff designed for advanced spellcasters. High capacity for complex enchantments.',
+    twoHanded: true,
   },
   battlestaff: {
     id: 'battlestaff',
@@ -68,6 +72,7 @@ export const EQUIPMENT_TYPES: Record<string, EquipmentType> = {
     slot: 'mainHand',
     baseCapacity: 70,
     description: 'A reinforced staff suitable for both casting and combat.',
+    twoHanded: true,
   },
   
   // ─── Main Hand - Catalysts ────────────────────────────────────────────────
@@ -438,6 +443,7 @@ export function getAllEquipmentTypes(): EquipmentType[] {
 }
 
 // Get valid slots for a category
+// Note: For 2-handed weapons, use getValidSlotsForEquipmentType instead
 export function getValidSlotsForCategory(category: EquipmentCategory): EquipmentSlot[] {
   switch (category) {
     case 'caster':
@@ -461,6 +467,17 @@ export function getValidSlotsForCategory(category: EquipmentCategory): Equipment
   }
 }
 
+// Get valid slots for a specific equipment type (considers 2-handed weapons)
+export function getValidSlotsForEquipmentType(equipType: EquipmentType): EquipmentSlot[] {
+  // 2-handed weapons occupy both main hand and offhand
+  if (equipType.twoHanded) {
+    return ['mainHand', 'offHand'];
+  }
+  
+  // Otherwise use category-based slots
+  return getValidSlotsForCategory(equipType.category);
+}
+
 // Check if an equipment type can be equipped in a specific slot
 export function canEquipInSlot(equipmentType: EquipmentType, slot: EquipmentSlot): boolean {
   const validSlots = getValidSlotsForCategory(equipmentType.category);