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/gameLayout.tsx

@@ -27,10 +27,12 @@ import { EditProfileModal } from "./editProfileModal.js";
 import { EquipmentPanel } from "./equipmentPanel.js";
 import { ExplorationPanel } from "./explorationPanel.js";
 import { LoginBonusModal } from "./loginBonusModal.js";
+import { MilestoneToast } from "./milestoneToast.js";
 import { OfflineModal } from "./offlineModal.js";
 import { OutdatedSchemaModal } from "./outdatedSchemaModal.js";
 import { PrestigePanel } from "./prestigePanel.js";
 import { QuestPanel } from "./questPanel.js";
+import { QuestCompleteToast, QuestFailedToast } from "./questToast.js";
 import { StatisticsPanel } from "./statisticsPanel.js";
 import { StoryPanel } from "./storyPanel.js";
 import { StoryToast } from "./storyToast.js";
@@ -164,9 +166,14 @@ const GameLayout = (): JSX.Element => {
       {schemaOutdated && !dismissedOutdatedWarning
         ? <OutdatedSchemaModal onDismiss={handleDismissOutdated} />
         : null}
-      <AchievementToast />
-      <CodexToast />
-      <StoryToast />
+      <div className="achievement-toast-container">
+        <AchievementToast />
+        <CodexToast />
+        <MilestoneToast />
+        <QuestCompleteToast />
+        <QuestFailedToast />
+        <StoryToast />
+      </div>
       {loginBonus === null
         ? null
         : <LoginBonusModal bonus={loginBonus} onClose={dismissLoginBonus} />