feat: fase 2+3 — expansion masiva multi-perfil + bug fixes + hardening

Fase 2 (expansion):
- Francesca: +6 etapas matematicas (5-10), +7 etapas lectura (3-9), +2 ortografia
- Sebastian: +8 etapas matematicas (4-11), +6 lectura, +3 historia, +3 geografia, +1 banderas
- Nuevas paginas: ortografia, lectura, geografia, matematicas
- ~900 ejercicios nuevos, paridad ~500 por perfil

Fase 3 (bug fixes + hardening):
- Fix: SessionLog auto-create en grade route
- Fix: engine cache (no borrar antes de revisar)
- Fix: FSRS cards actualizadas en flujo curriculum
- Fix: responseMs real (no hardcodeado 3000)
- Fix: options dentro de content en sebastian etapa-1
- Fix: trazo-letra consonantes crash
- Security: execFileSync anti-command-injection en TTS
- DB: 18 cascade deletes + indices + unique constraints
- APIs debug: reset, state, seed
- Docker: espeak-ng + prisma + user/group
- E2E: 23 tests nuevos (curriculum-flow.spec.ts)
- Code review: tailwind colors, middleware dev mode, eslint config

Verificado: tsc exit 0, build exit 0, 61 E2E tests pass

app/sebastian/page.tsx

@@ -8,8 +8,10 @@ import AudioUnlock from "@/components/child/audio-unlock"
 const SEBASTIAN_KEY = "edueasy_child_sebastian"
 
 const activities = [
-  { id: "sumas", label: "Sumas avanzadas", icon: "➕", description: "Sumas de 2 y 3 dígitos" },
-  { id: "historia", label: "Historia argentina", icon: "🇦🇷", description: "Personajes y eventos" },
+  { id: "matematicas", label: "Matemáticas", icon: "➕", description: "Sumas, restas, multiplicación, división, fracciones" },
+  { id: "lectura", label: "Lectura", icon: "📖", description: "Textos informativos y comprensión" },
+  { id: "historia", label: "Historia argentina", icon: "🇦🇷", description: "Personajes, fechas y eventos" },
+  { id: "geografia", label: "Geografía", icon: "🗺️", description: "Provincias, ríos y regiones" },
   { id: "banderas", label: "Banderas", icon: "🚩", description: "Provincias y símbolos" },
   { id: "logros", label: "Mis logros", icon: "⭐", color: "bg-warning" },
   { id: "pairing", label: "iPad nuevo", icon: "🔗", color: "bg-secondary" },
@@ -24,6 +26,16 @@ export default function SebastianHome() {
     setPaired(!!localStorage.getItem(SEBASTIAN_KEY))
   }, [])
 
+  const handleActivity = (id: string) => {
+    if (id === "logros") {
+      router.push("/child/logros?profile=sebastian")
+    } else if (id === "pairing") {
+      router.push("/child/pairing?profile=sebastian")
+    } else {
+      router.push(`/sebastian/${id}`)
+    }
+  }
+
   if (!audioReady) {
     return <AudioUnlock onUnlock={() => setAudioReady(true)} />
   }
@@ -47,7 +59,7 @@ export default function SebastianHome() {
           {activities.map((a) => (
             <button
               key={a.id}
-              onClick={() => router.push(`/sebastian/${a.id}`)}
+              onClick={() => handleActivity(a.id)}
               className={`${a.color || "bg-accent"} text-primary-foreground touch-target-lg rounded-2xl flex items-center gap-4 px-6 py-5 text-xl font-display font-semibold shadow-md active:scale-95 transition-transform`}
             >
               <span className="text-2xl">{a.icon}</span>