fix(reports): lock email-only options when mail isn't set up (#141)

[ibrahimroshdy]

Closes #141.

On a server without mail, Email it to me and Send it again in Print inventory looked like normal options: you could turn them on and nothing ever arrived. Now they're locked and say why, and the server refuses them too.

What a person sees

• Mail not set up on the server: both options are disabled and dimmed, with a lock and the line "Email isn't set up on this server."
  • Instance admins, and owners and admins of the location, also get Set up email, which opens the docs' Mail page (/admin/notifications/#mail).
  • Everyone else reads "Ask the owner to set up email."
• Account with no email address (a managed account): the same lock, with "Add an email address to your account."
• Screen readers: the switch and the Send it again group are disabled, and aria-describedby points both at the lock line.
• With mail set up, nothing changes.

How it works

• Web: the sheet reads smtpConfigured from the notification settings it already had, plus /me for the address and the location list for the role. Until the settings load, nothing is locked; the server catches anything sent in that gap. A locked option is never put in the request.
• Server: POST /api/v1/reports/inventory and /reports/insurance with email: true, and PUT /api/v1/me/report-schedules, now return 409 mail_not_configured when KEPT_SMTP_URL is unset, and 409 no_email_address when the account has no address it can send to. Before, these were accepted and the mail was dropped. Both codes are new in @kept/shared; the web shows each as one sentence.
• An address that isn't verified yet is still accepted, as before.
• The mock API refuses these requests the same way.

Audit of other email-only options

• Invite → Send by email: already a disabled placeholder that says why (unchanged).
• Settings → Notifications → Email channel: already says mail is off and hides Test.
• Digests and alerts follow the channel. Exports, condition reports and move sheets never send mail.
• Not covered: a schedule made while mail worked keeps running if mail is removed later. The run is made and the mail is logged as due.

Docs and spec

• Users' "Reports" section and the admin Mail page say what is locked and why.
• D254.

Tested

• Server: src/reports/reports.test.ts adds two cases: mail off refuses email: true and a schedule while a plain report still runs; an account with no address is refused. The existing mail tests now run with mail configured.
• Web: test/screens/reports.test.tsx adds six cases: mail on means nothing is locked; mail off as owner shows the lock, the description and the link, and the PDF still runs without email; a member gets "ask the owner"; no address; the server's refusal shown as a sentence; Arabic keeps to logical CSS.
• ci-local.sh --only lint,typecheck,drift, check-i18n, check-logical-css, the full server suite.