Adds the Microsoft Entra ID provider to NextAuth alongside the existing
credentials provider. Sign-in is restricted to Pelagia Marine's M365
tenant via the issuer URL; access is further gated by requiring a
matching active user record in the DB (DB-managed roles remain unchanged).
- auth.ts: add MicrosoftEntra provider, signIn callback (DB lookup),
async jwt callback to populate id/role on first SSO sign-in
- login-form.tsx: add primary "Sign in with Microsoft 365" button with
Microsoft logo; credentials form kept as a fallback below a divider
- prisma: make passwordHash nullable (migration applied) to allow
SSO-only users without a local password
- admin/users: password is now optional when creating a user — leave
blank for SSO-only accounts
- profile/actions: return a clear error if an SSO user (no passwordHash)
attempts to use the change-password form
- .env.example: document AZURE_AD_CLIENT_ID/SECRET/TENANT_ID
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Hardik
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