test: split vitest into node + nuxt projects and add a Postgres harness

Component/runtime specs (*.nuxt.spec.ts) run in the Nuxt environment; all
other specs run in a plain node environment where node_modules stay external,
so native CJS deps like `pg` load correctly (the Nuxt runtime inlines them and
breaks pg's internal `class … extends Pool`). Adds tests/helpers/db.ts, which
spins up and migrates a dedicated test database for repository integration
tests, and renames the board spec to the .nuxt suffix.

tests/helpers/db.ts

@@ -0,0 +1,57 @@
+// Integration-test harness for the Postgres-backed repositories.
+//
+// Tests run against a dedicated database (default `andon_test`) so they never
+// touch dev data. The database is created if missing and migrated to the
+// current schema; `truncateAll` resets state between tests.
+import { createRequire } from 'node:module'
+import type pgType from 'pg'
+import { drizzle, type NodePgDatabase } from 'drizzle-orm/node-postgres'
+import { migrate } from 'drizzle-orm/node-postgres/migrator'
+import { sql } from 'drizzle-orm'
+import * as schema from '../../server/db/schema'
+
+// Load `pg` through a native CJS require. Importing it via Vite's SSR transform
+// breaks pg's internal `class … extends Pool` (the require of `pg-pool` resolves
+// to a module namespace), so we sidestep the transform entirely.
+const pg = createRequire(import.meta.url)('pg') as typeof pgType
+
+const TEST_URL =
+  process.env.TEST_DATABASE_URL ??
+  'postgres://andon:andon@localhost:5432/andon_test'
+
+export type TestDb = NodePgDatabase<typeof schema>
+
+/** Connect to the test database (creating + migrating it first) and return a client + pool. */
+export async function setupTestDb(): Promise<{ db: TestDb; pool: pgType.Pool }> {
+  await ensureDatabaseExists(TEST_URL)
+  const pool = new pg.Pool({ connectionString: TEST_URL })
+  const db = drizzle(pool, { schema })
+  await migrate(db, { migrationsFolder: 'server/db/migrations' })
+  return { db, pool }
+}
+
+/** Wipe all rows so each test starts from a clean slate. */
+export async function truncateAll(db: TestDb): Promise<void> {
+  await db.execute(
+    sql`TRUNCATE TABLE defects, projects, push_subscriptions RESTART IDENTITY CASCADE`,
+  )
+}
+
+/** Create the target database via the maintenance `postgres` DB if it doesn't exist. */
+async function ensureDatabaseExists(url: string): Promise<void> {
+  const dbName = new URL(url).pathname.slice(1)
+  const adminUrl = new URL(url)
+  adminUrl.pathname = '/postgres'
+
+  const admin = new pg.Client({ connectionString: adminUrl.toString() })
+  await admin.connect()
+  try {
+    const { rowCount } = await admin.query(
+      'SELECT 1 FROM pg_database WHERE datname = $1',
+      [dbName],
+    )
+    if (!rowCount) await admin.query(`CREATE DATABASE "${dbName}"`)
+  } finally {
+    await admin.end()
+  }
+}