feat: unify toast styles and add quest/milestone toast notifications

- Merge .codex-toast and .achievement-toast into a single .game-toast class
- Fix storyToast inner class names and replace <button> wrapper with <div>
- Add QuestCompleteToast and QuestFailedToast components
- Add MilestoneToast for prestige, transcendence, and apotheosis events
- Move shared toast container to gameLayout so all toasts stack in one column
- Wire quest detection in GameContext to store full Quest objects for toast names
- Trigger prestige toast from both auto-prestige and manual prestige panel

apps/web/src/components/game/questPanel.tsx

@@ -190,10 +190,11 @@ const QuestPanel = (): JSX.Element => {
   }
 
   const { adventurers, autoQuest, quests, zones } = state;
-  // eslint-disable-next-line unicorn/no-array-reduce -- Need the total!
-  const partyCombatPower = adventurers.reduce((total, adventurer) => {
-    return total + adventurer.combatPower * adventurer.count;
-  }, 0);
+  let partyCombatPower = 0;
+  for (const adventurer of adventurers) {
+    const contribution = adventurer.combatPower * adventurer.count;
+    partyCombatPower = partyCombatPower + contribution;
+  }
   const zoneQuests = quests.filter(({ zoneId }) => {
     return zoneId === activeZoneId;
   });