fix: use UUID for user IDs to match Supabase auth.uid()

server/schema_supabase.sql

@@ -1,8 +1,8 @@
 -- ── Esquema Supabase PostgreSQL (migrado de SQLite) ──────────────
 
--- Tabla users (Persona A)
+-- Tabla users (Persona A) — ID como UUID para Supabase Auth
 CREATE TABLE IF NOT EXISTS users (
-    id BIGSERIAL PRIMARY KEY,
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
     email TEXT UNIQUE NOT NULL,
     phone TEXT,
     password_hash TEXT NOT NULL,
@@ -13,7 +13,7 @@ CREATE TABLE IF NOT EXISTS users (
 -- Tabla addresses (Persona A)
 CREATE TABLE IF NOT EXISTS addresses (
     id BIGSERIAL PRIMARY KEY,
-    user_id BIGINT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
     alias TEXT,
     lat DOUBLE PRECISION NOT NULL,
     lng DOUBLE PRECISION NOT NULL,
@@ -23,7 +23,7 @@ CREATE TABLE IF NOT EXISTS addresses (
 
 -- Tabla notification_preferences (Persona A)
 CREATE TABLE IF NOT EXISTS notification_preferences (
-    user_id BIGINT PRIMARY KEY REFERENCES users(id) ON DELETE CASCADE,
+    user_id UUID PRIMARY KEY REFERENCES users(id) ON DELETE CASCADE,
     notify_proximity BOOLEAN DEFAULT TRUE,
     notify_breakdown BOOLEAN DEFAULT TRUE,
     notify_delay BOOLEAN DEFAULT TRUE,
@@ -91,15 +91,15 @@ ALTER TABLE notificaciones ENABLE ROW LEVEL SECURITY;
 
 -- Policy: users solo ven su propio perfil
 CREATE POLICY "Users can view own profile" ON users
-    FOR SELECT USING (auth.uid()::TEXT = id::TEXT);
+    FOR SELECT USING (auth.uid() = id);
 
 -- Policy: addresses solo de usuario autenticado
 CREATE POLICY "Users can view own addresses" ON addresses
-    FOR SELECT USING (user_id = auth.uid()::BIGINT);
+    FOR SELECT USING (user_id = auth.uid());
 
 -- Policy: notification_preferences solo de usuario autenticado
 CREATE POLICY "Users can view own preferences" ON notification_preferences
-    FOR SELECT USING (user_id = auth.uid()::BIGINT);
+    FOR SELECT USING (user_id = auth.uid());
 
 -- ── Seed data ──────────────────────────────────────────────────
 INSERT INTO rutas (id, nombre, turno) VALUES