feat(ST-qfpqpxzy): DB schema + settings-UI voor min_quota_pct worker-drempel (#118)

- User.min_quota_pct Int @default(20) + ClaudeWorker.last_quota_pct/last_quota_check_at
- Migratie add_worker_quota_gate
- lib/schemas/user.ts: minQuotaPctSchema (int, 1-100)
- actions/settings.ts: updateMinQuotaPctAction met auth/demo/zod-guard
- MinQuotaEditor component met numeric input en DemoTooltip
- Settings-pagina: Worker-instellingen sectie

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

__tests__/actions/settings.test.ts

@@ -0,0 +1,72 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest'
+
+const { mockUserUpdate, mockGetIronSession } = vi.hoisted(() => ({
+  mockUserUpdate: vi.fn(),
+  mockGetIronSession: vi.fn(),
+}))
+
+vi.mock('next/cache', () => ({ revalidatePath: vi.fn() }))
+vi.mock('next/headers', () => ({ cookies: vi.fn().mockResolvedValue({}) }))
+vi.mock('iron-session', () => ({ getIronSession: mockGetIronSession }))
+vi.mock('@/lib/session', () => ({ sessionOptions: { cookieName: 'test', password: 'test' } }))
+vi.mock('@/lib/prisma', () => ({
+  prisma: { user: { update: mockUserUpdate } },
+}))
+
+import { updateMinQuotaPctAction } from '@/actions/settings'
+
+const SESSION_USER = { userId: 'user-1', isDemo: false }
+const SESSION_DEMO = { userId: 'demo-1', isDemo: true }
+const SESSION_UNAUTH = { userId: undefined, isDemo: false }
+
+describe('updateMinQuotaPctAction', () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+    mockUserUpdate.mockResolvedValue({})
+  })
+
+  it('returns error when not authenticated', async () => {
+    mockGetIronSession.mockResolvedValue(SESSION_UNAUTH)
+    const result = await updateMinQuotaPctAction(20)
+    expect(result).toMatchObject({ error: expect.any(String) })
+    expect(mockUserUpdate).not.toHaveBeenCalled()
+  })
+
+  it('returns 403 error for demo session', async () => {
+    mockGetIronSession.mockResolvedValue(SESSION_DEMO)
+    const result = await updateMinQuotaPctAction(20)
+    expect(result).toMatchObject({ status: 403 })
+    expect(mockUserUpdate).not.toHaveBeenCalled()
+  })
+
+  it('returns 422 error when value is 0 (below min)', async () => {
+    mockGetIronSession.mockResolvedValue(SESSION_USER)
+    const result = await updateMinQuotaPctAction(0)
+    expect(result).toMatchObject({ status: 422 })
+    expect(mockUserUpdate).not.toHaveBeenCalled()
+  })
+
+  it('returns 422 error when value is 101 (above max)', async () => {
+    mockGetIronSession.mockResolvedValue(SESSION_USER)
+    const result = await updateMinQuotaPctAction(101)
+    expect(result).toMatchObject({ status: 422 })
+    expect(mockUserUpdate).not.toHaveBeenCalled()
+  })
+
+  it('saves valid value and returns success', async () => {
+    mockGetIronSession.mockResolvedValue(SESSION_USER)
+    const result = await updateMinQuotaPctAction(35)
+    expect(result).toEqual({ success: true })
+    expect(mockUserUpdate).toHaveBeenCalledWith({
+      where: { id: 'user-1' },
+      data: { min_quota_pct: 35 },
+    })
+  })
+
+  it('accepts boundary values 1 and 100', async () => {
+    mockGetIronSession.mockResolvedValue(SESSION_USER)
+    await updateMinQuotaPctAction(1)
+    await updateMinQuotaPctAction(100)
+    expect(mockUserUpdate).toHaveBeenCalledTimes(2)
+  })
+})