feat(auth): koppla login/register till Firebase → /v1/auth/session (AUTH-5)

apps/api/src/routes/auth.ts

@@ -26,6 +26,7 @@ import { createFirebaseTokenVerifier, type TokenVerifier } from "../lib/token-ve
 /** Body-schema för Firebase-sessionväxling. */
 const firebaseSessionInputSchema = z.object({
  idToken: z.string().min(1),
+ displayName: z.string().optional(),
  locale: z.string().optional(),
 });
 
@@ -168,7 +169,7 @@ export async function authRoutes(app: FastifyInstance) {
  if (!user) {
  if (!identity.email) throw errors.badRequest("Firebase-token saknar e-postadress.");
  const locale = input.locale ?? "sv-SE";
- const displayName = identity.name ?? identity.email.split("@")[0] ?? "Användare";
+ const displayName = input.displayName ?? identity.name ?? identity.email.split("@")[0] ?? "Användare";
  [user] = await app.db
  .insert(schema.users)
  .values({