fix: add missing getAuth import and fix db.insert() mock chain

Fixes two bugs found in QA review:
- ReferenceError: getAuth not defined in beforeEach - add import
- TypeError: wrong mock chain insert().into().values() vs insert().values()

Co-Authored-By: Paperclip <noreply@paperclip.ing>

src/__tests__/portalSessionFromAuth.test.ts

@@ -1,5 +1,6 @@
 import { describe, it, expect, vi, beforeEach } from "vitest";
 import { Hono } from "hono";
+import { getAuth } from "../lib/auth.js";
 
 const CLIENT_ID = "550e8400-e29b-41d4-a716-446655440001";
 const CLIENT_EMAIL = "alice@example.com";
@@ -71,8 +72,7 @@ vi.mock("@groombook/db", () => {
           return makeChainable([]);
         },
       }),
-      insert: () => ({
+      insert: (table: { _name: string }) => ({
-        into: (table: { _name: string }) => ({
         values: (vals: Record<string, unknown>) => ({
           returning: () => {
             if (table._name === "impersonationSessions") {
@@ -84,7 +84,6 @@ vi.mock("@groombook/db", () => {
         }),
       }),
     }),
-    }),
     impersonationSessions,
     clients,
     staff,