fix: meditation multiplier cap 2.5x, discipline reactivation, Spire crash, earthShard recipe, fabricator E2E test

src/components/game/tabs/DisciplinesTab.tsx

@@ -89,7 +89,7 @@ export const DisciplinesTab: React.FC = () => {
 
   const handleToggle = useCallback((id: string, paused: boolean) => {
     if (paused) {
-      activate(id, { elements, signedPacts });
+      activate(id, { elements, signedPacts, rawMana });
     } else {
       deactivate(id);
     }

src/components/game/tabs/SpireCombatPage/SpireCombatPage.tsx

@@ -102,12 +102,30 @@ export function SpireCombatPage() {
     insight: s.insight,
   })));
 
-  const equippedInstances = useCraftingStore((s) => s.equippedInstances);
-  const equipmentInstances = useCraftingStore((s) => s.equipmentInstances);
+  const { equippedInstances, equipmentInstances } = useCraftingStore(useShallow((s) => ({
+    equippedInstances: s.equippedInstances,
+    equipmentInstances: s.equipmentInstances,
+  })));
 
   const { maxMana, baseRegen } = useSpireStats(prestigeUpgrades, equippedInstances, equipmentInstances);
 
-  const totalRooms = useMemo(() => getRoomsForFloor(currentFloor), [currentFloor]);
+  // Use a deterministic seed based on floor to avoid Math.random() causing
+  // referential instability and infinite re-render loops.
+  const seededRandom = useMemo(() => {
+    let seed = currentFloor * 12345;
+    return () => {
+      seed = (seed * 16807 + 0) % 2147483647;
+      return (seed - 1) / 2147483646;
+    };
+  }, [currentFloor]);
+  const totalRooms = useMemo(() => {
+    if (isGuardianFloor(currentFloor)) return 1;
+    const base = 5;
+    const range = 10;
+    const floorBonus = Math.min(range, Math.floor(currentFloor / 20));
+    const randomVariation = Math.floor(seededRandom() * 3);
+    return base + floorBonus + randomVariation;
+  }, [currentFloor, seededRandom]);
 
   useEffect(() => {
     setRoomsCleared(0);