fix: deduct component consumption from element pools in mana conversion

Bug #293: elementDrain was computed but never subtracted from element pools.
The tick pipeline now applies net regen (produced - drained) instead of
gross production to element pools, matching the spec §8 regen deduction model.

src/lib/game/stores/gameStore.ts

@@ -184,12 +184,6 @@ export const useGameStore = create<GameCoordinatorStore>()(
             }
           }
 
-          // Apply produced element mana (from active conversions)
-          for (const [elem, entry] of Object.entries(conversionResult.rates)) {
-            if (entry.paused || entry.finalRate <= 0 || !elements[elem]) continue;
-            if (!elements[elem].unlocked) elements[elem] = { ...elements[elem], unlocked: true };
-            elements[elem] = { ...elements[elem], current: Math.min(elements[elem].max, elements[elem].current + entry.finalRate * HOURS_PER_TICK) };
-          }
           // Compute per-element net regen: produced rate - drain from being used as component
           const elementRegen: Record<string, number> = {};
           for (const [elem, entry] of Object.entries(conversionResult.rates)) {
@@ -197,6 +191,18 @@ export const useGameStore = create<GameCoordinatorStore>()(
             const drained = conversionResult.elementDrain[elem] || 0;
             elementRegen[elem] = produced - drained;
           }
+          // Apply net element regen to pools: produced - drained (component consumption)
+          for (const [elem, entry] of Object.entries(conversionResult.rates)) {
+            if (entry.paused || !elements[elem]) continue;
+            if (!elements[elem].unlocked) elements[elem] = { ...elements[elem], unlocked: true };
+            const netRate = elementRegen[elem];
+            if (netRate === 0) continue;
+            const delta = netRate * HOURS_PER_TICK;
+            const newCurrent = delta >= 0
+              ? Math.min(elements[elem].max, elements[elem].current + delta)
+              : Math.max(0, elements[elem].current + delta);
+            elements[elem] = { ...elements[elem], current: newCurrent };
+          }
           // Net raw regen = gross regen - conversion drains - incursion
           const netRawRegen = Math.max(0, baseRegen * (1 - incursionStrength) * meditationMultiplier - conversionResult.totalRawDrain);
           const actualRegen = Math.floor(Math.min(netRawRegen * HOURS_PER_TICK, maxMana - rawMana) * 1000) / 1000;