feat: reconexión de sesión + 6 nuevas categorías + corrección de bugs

- Añade sistema de reconexión tras refresh/cierre del navegador
  - Persistencia de sesión en localStorage (3h TTL)
  - Banner de reconexión en Home
  - Evento rejoin_room en backend

- Nuevas categorías: Series TV, Marvel/DC, Disney, Memes, Pokémon, Mitología

- Correcciones de bugs:
  - Fix: juego bloqueado al fallar robo (steal decision)
  - Fix: jugador duplicado al cambiar de equipo
  - Fix: rotación incorrecta de turno tras fallo

- Config: soporte para Cloudflare tunnel (allowedHosts)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/hooks/useSocket.ts

@@ -1,5 +1,5 @@
 import { useEffect, useCallback } from 'react'
-import { useGameStore } from '../stores/gameStore'
+import { useGameStore, saveSession, clearSession } from '../stores/gameStore'
 import { soundPlayer } from './useSound'
 import { useThemeStore } from '../stores/themeStore'
 import { useSoundStore } from '../stores/soundStore'
@@ -58,6 +58,25 @@ export function useSocket() {
       setRoom(data.room)
     })
 
+    // Reconnection events
+    socket.on('rejoin_success', (data: { room: GameRoom; player_name: string; team: 'A' | 'B' }) => {
+      console.log('Rejoin successful:', data.player_name)
+      setRoom(data.room)
+      useGameStore.getState().setPlayerName(data.player_name)
+      // Update saved session with possibly new team
+      saveSession(data.room.code, data.player_name, data.team)
+    })
+
+    socket.on('rejoin_failed', (data: { message: string }) => {
+      console.log('Rejoin failed:', data.message)
+      clearSession()
+    })
+
+    socket.on('player_reconnected', (data: { player_name: string; team: string; room: GameRoom }) => {
+      console.log('Player reconnected:', data.player_name)
+      setRoom(data.room)
+    })
+
     // Game events
     socket.on('game_started', (data: { room: GameRoom }) => {
       setRoom(data.room)
@@ -268,10 +287,19 @@ export function useSocket() {
     socketService.emit('timer_expired', {})
   }, [])
 
+  const rejoinRoom = useCallback((roomCode: string, playerName: string, team: 'A' | 'B') => {
+    socketService.emit('rejoin_room', {
+      room_code: roomCode,
+      player_name: playerName,
+      team,
+    })
+  }, [])
+
   return {
     socket: socketService.connect(),
     createRoom,
     joinRoom,
+    rejoinRoom,
     changeTeam,
     startGame,
     selectQuestion,