Fix Task6: Remove duplicate SpireTab.tsx and verify swarm mode

- Deleted old src/components/game/SpireTab.tsx (duplicate of tabs/SpireTab.tsx)
- Verified SWARM_CONFIG: 15% chance, 3-6 enemies at 40% HP
- Verified UI in tabs/SpireTab.tsx correctly renders each swarm enemy individually
- Verified generateSwarmEnemies() and generateRoomType() logic is correct

src/components/game/tabs/SpireTab.tsx

@@ -353,11 +353,11 @@ export function SpireTab({ store, simpleMode = false }: SpireTabProps) {
                           </span>
                         </div>
                         <div className="text-xs text-gray-400 game-mono mb-1">
-                          ⚔️ {fmt(totalDPS)} DPS • 
+                          ⚔️ {fmt(calcDamage(store, spellId))} dmg/cast • 
                           <span style={{ color: getSpellCostColor(spellDef.cost) }}>
                             {' '}{formatSpellCost(spellDef.cost)}
                           </span>
-                          {' '}• ⚡ {(spellDef.castSpeed || 1).toFixed(1)}/hr
+                          {' '}• ⚡ {fmt(Math.floor(calcDamage(store, spellId) * (spellDef.castSpeed || 1)))} dmg/hr
                         </div>
                       
                         {/* Cast progress bar when climbing */}