fix: 6 priority-3 bug fixes with regression tests

- Issue 83: Mana Tide pulse factor now ranges 0.5x-1.5x (was 0.5x-1.0x)
- Issue 82: SteadyStream no longer returns early like EternalFlow; only skips incursion penalty
- Issue 81: Prestige store partialize now includes defeatedGuardians, signedPacts, signedPactDetails, pactRitualFloor, pactRitualProgress, loopInsight, pactSlots
- Issue 80: Combat store partialize now includes floorHP, floorMaxHP, castProgress, spireMode, clearedFloors, golemancy, equipmentSpellStates, activityLog, achievements
- Issue 78: cancelDesign now always cancels designProgress first, then designProgress2
- Issue 79: startDesigningEnchantment now uses designProgress2 when designProgress is occupied

Added 13 regression tests in src/lib/game/__tests__/regression-fixes.test.ts
Refactored craftingStore types to craftingStore.types.ts to stay under 400-line limit

src/lib/game/effects/dynamic-compute.ts

@@ -53,8 +53,7 @@ export function computeDynamicRegen(
   
   // Mana Tide: Regen pulses ±50% (sinusoidal based on time)
   if (hasSpecial(effects, SPECIAL_EFFECTS.MANA_TIDE)) {
-    const pulseFactor = 0.5 + 0.5 * Math.sin(Date.now() / 10000);
-    regen *= (0.5 + pulseFactor * 0.5);
+    regen *= (1.0 + 0.5 * Math.sin(Date.now() / 10000));
   }
   
   // Eternal Flow: Regen immune to ALL penalties
@@ -62,14 +61,14 @@ export function computeDynamicRegen(
     return regen * effects.regenMultiplier;
   }
   
-  // Steady Stream: Regen immune to incursion
+  // Steady Stream: Regen immune to incursion (skip incursion penalty only)
   if (hasSpecial(effects, SPECIAL_EFFECTS.STEADY_STREAM)) {
-    return regen * effects.regenMultiplier;
+    // incursion penalty is skipped, but regenMultiplier still applies below
+  } else {
+    // Apply incursion penalty
+    regen *= (1 - incursionStrength);
   }
   
-  // Apply incursion penalty
-  regen *= (1 - incursionStrength);
-  
   return regen * effects.regenMultiplier;
 }