Companion: selectable companions with a picker

Click the mascot to open a bilingual picker and switch between the Sleepy Cat
(always asleep, still talks in her sleep) and the Happy Dog (awake/bouncy).
Choice persists in localStorage.

- companions.ts is the roster; add one by dropping a pure-vector Lottie JSON
  in animations/ and appending a COMPANIONS entry.
- napping = companion.alwaysAsleep || mood === 'sleeping' drives the sway/zzz.
- Removed the old single MOOD_ANIMATIONS map (animations/index.ts).

Claude-Session: https://claude.ai/code/session_016Yr6jELuRc7hyzYLccQKZd

web/src/components/Companion/companions.ts

@@ -0,0 +1,49 @@
+import type { Mood } from './useCompanion'
+import sleepingCat from './animations/sleeping-cat.json'
+import happyDog from './animations/happy-dog.json'
+
+export interface Companion {
+  id: string
+  name: string // English label
+  zh: string // Chinese label (she reads Mandarin — north star Note #17)
+  emoji: string // shown in the picker + used as the per-mood fallback base
+  // mood → Lottie asset. Unmapped moods fall back to the per-mood emoji.
+  animations: Partial<Record<Mood, object>>
+  // When true the mascot keeps its calm sway + drifting zzz regardless of mood
+  // (e.g. a cat that's always asleep but still talks in its sleep).
+  alwaysAsleep?: boolean
+}
+
+// The roster. Add a companion by dropping a pure-vector Lottie JSON into
+// ./animations and appending an entry here — that's the whole change.
+export const COMPANIONS: Companion[] = [
+  {
+    id: 'cat',
+    name: 'Sleepy Cat',
+    zh: '瞌睡猫',
+    emoji: '😴',
+    alwaysAsleep: true,
+    animations: {
+      idle: sleepingCat,
+      happy: sleepingCat,
+      talking: sleepingCat,
+      celebrate: sleepingCat,
+      sleeping: sleepingCat,
+    },
+  },
+  {
+    id: 'dog',
+    name: 'Happy Dog',
+    zh: '开心狗',
+    emoji: '🐶',
+    animations: {
+      idle: happyDog,
+      happy: happyDog,
+      talking: happyDog,
+      celebrate: happyDog,
+      // no sleeping clip → naps with the 😴 emoji fallback
+    },
+  },
+]
+
+export const DEFAULT_COMPANION = 'cat'