feat: More bonus (exponential) and method to list icons needed

public/js/engine/effects.js

@@ -72,11 +72,23 @@ const APPLY = {
 
 export const EFFECT_TYPES = Object.keys(APPLY);
 
+// Endless upgrades stack without limit, so keep every result finite and sensible.
+const CAP = 1e100; // low enough that products of several multipliers stay finite; real play never gets close
+const FLOORS = { generatorCost: 0.05, batchDiscount: 0.001 };
+
+function finalize(m) {
+  const keep = (value) => (Number.isFinite(value) ? Math.min(CAP, value) : CAP);
+  for (const key of Object.keys(m)) if (typeof m[key] === 'number') m[key] = keep(m[key]);
+  for (const id of Object.keys(m.generators)) m.generators[id] = keep(m.generators[id]);
+  for (const [key, floor] of Object.entries(FLOORS)) m[key] = Math.max(floor, m[key]);
+  return m;
+}
+
 /** Fold a list of `{ effect, times }` entries into one set of multipliers. */
 export function foldEffects(entries) {
   const m = newModifiers();
   for (const { effect, times = 1 } of entries) {
     if (effect && times > 0) APPLY[effect.type]?.(m, effect, times);
   }
-  return m;
+  return finalize(m);
 }