feat: profile page character display, persistent auth, cleanup

- Large animated sprite on BotProfilePage with tier-aware rendering
- Dynamic status titles (UNSTOPPABLE, ON FIRE, FRESH MEAT, etc.)
- Nostr auth persisted to localStorage — survives navigation and HMR
- Remove grotesque close-up overlays (eyeballs, tongues, teeth, drool)
- Remove crowd cheering signs (too small to look good)
- Add archetype to bot stats API response
- SpritePreview now accepts tier prop

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/composables/useNostr.ts

@@ -26,15 +26,41 @@ declare global {
   }
 }
 
-const pubkey = ref<string | null>(null)
-const bot = ref<BotData | null>(null)
-const profilePicUrl = ref<string | null>(null)
+// Persist auth state across page navigations and HMR reloads
+function loadStored<T>(key: string): T | null {
+  try {
+    const raw = localStorage.getItem(key)
+    return raw ? JSON.parse(raw) : null
+  } catch { return null }
+}
+function store(key: string, value: unknown) {
+  if (value == null) localStorage.removeItem(key)
+  else localStorage.setItem(key, JSON.stringify(value))
+}
+
+const pubkey = ref<string | null>(loadStored('bf_pubkey'))
+const bot = ref<BotData | null>(loadStored('bf_bot'))
+const profilePicUrl = ref<string | null>(loadStored('bf_pic'))
 const isLoading = ref(false)
 
 export function useNostr() {
   const isLoggedIn = computed(() => !!pubkey.value && !!bot.value)
   const hasExtension = computed(() => !!window.nostr)
 
+  // Restore session on first load — re-verify with server
+  if (pubkey.value && !bot.value) {
+    fetch('/api/auth/login', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ pubkey: pubkey.value }),
+    }).then(r => r.json()).then(data => {
+      if (data.exists) {
+        bot.value = data.bot
+        store('bf_bot', data.bot)
+      }
+    }).catch(() => {})
+  }
+
   async function login(): Promise<{ pubkey: string; bot: BotData | null }> {
     if (!window.nostr) {
       throw new Error('No Nostr extension found. Install nos2x, Alby, or another NIP-07 extension.')
@@ -44,10 +70,11 @@ export function useNostr() {
     try {
       const pk = await window.nostr.getPublicKey()
       pubkey.value = pk
+      store('bf_pubkey', pk)
 
       // Fetch Nostr profile pic from relay
       const pic = await fetchNostrProfilePic(pk)
-      if (pic) profilePicUrl.value = pic
+      if (pic) { profilePicUrl.value = pic; store('bf_pic', pic) }
 
       // Check if this pubkey has a bot
       const res = await fetch('/api/auth/login', {
@@ -60,6 +87,7 @@ export function useNostr() {
         const data = await res.json()
         if (data.exists) {
           bot.value = data.bot
+          store('bf_bot', data.bot)
           return { pubkey: pk, bot: data.bot }
         }
       }
@@ -101,6 +129,7 @@ export function useNostr() {
       bestStreak: 0,
       tier: 0,
     }
+    store('bf_bot', bot.value)
 
     return bot.value
   }
@@ -109,6 +138,9 @@ export function useNostr() {
     pubkey.value = null
     bot.value = null
     profilePicUrl.value = null
+    store('bf_pubkey', null)
+    store('bf_bot', null)
+    store('bf_pic', null)
   }
 
   return {