feat: add titles system with unlock tracking and character sheet display

Titles are earned by reaching milestones (quests, bosses, gold, clicks,
adventurers, guild, prestige, transcendence, apotheosis, achievements,
longevity) and are permanent - never lost on prestige/transcendence/
apotheosis resets. 20 titles available at launch.

Also fixes a pre-existing P2034 write-conflict on the load backfill path
and the exactOptionalPropertyTypes violation in the quest failure handler.

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

@@ -65,7 +65,11 @@ const HOW_TO_PLAY = [
   },
   {
     title: "📋 Character Sheet",
-    body: "Visit the Character tab to write about your character and guild. Fill in your character's name, pronouns, and backstory, then create a guild with its own name and lore. Your character sheet is visible on your public profile page.",
+    body: "Visit the Character tab to write about your character and guild. Fill in your character's name, pronouns, race, class, and backstory, then create a guild with its own name and lore. Your character sheet is visible on your public profile page.",
+  },
+  {
+    title: "🏅 Titles",
+    body: "Earn Titles by reaching milestones — defeating bosses, completing quests, prestiging, and more. Once unlocked, titles are yours forever and are never lost on prestige or transcendence resets. Set your active title from the Character tab to display it on your character sheet and public profile.",
   },
   {
     title: "☁️ Cloud Saves",