Admin ticket view: SMS card with auto phone, template draft and Moira button

Imported from GitHub issue El-SaMa/oma#237 by @El-SaMa.

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Why

On 15 Oct 2026 a paying client (#LH-1077) never saw our ticket replies and threatened a consumer complaint. Her own replies were dropped by a bad @gmail.com blocklist entry, which is now fixed. One short SMS saying "we replied, here is the link" would have saved it. Staff need a fast way to send that SMS from the ticket itself.

What to build

A SMS card in the right sidebar of the admin ticket view (/admin/tickets/[id]).

• To: filled from the client's contact phone (client_billing_profiles.phone, added in f636862f) and editable. If the client has no phone, show an empty field and a hint to add one (staff: oma.admin_manage_client update phone).
• Message textarea with a live character and SMS-part counter. Reuse smsSegments() from services/core-api/src/agent-tools/tools-twilio.ts (GSM-7 160/153, Unicode 70/67, max 459 chars / 3 parts).
• Default draft is a free template, no AI call. Use the client's language, fi or en:
  • fi: Lanetti: Vastasimme tukipyyntöösi #LH-1077, lue vastaus: https://oma.lanetti.fi/support/<ticketId>
  • en: Lanetti: We replied to your ticket #LH-1077, read it here: https://oma.lanetti.fi/support/<ticketId>
  • The link is always the customer-side URL /support/<id>, never /admin/....
• ✨ Moira button (AI icon, tooltip "Draft with Moira" / "Luonnostele Moiralla" / "Utkast med Moira"). It rewrites the draft as a short SMS summary of the latest staff reply. It must stay within 3 parts and keep the ticket ref and the customer link. Same path as oma.admin_ticket_draft, plus a short-SMS mode.
• Send SMS button with a confirm step showing the exact text. It sends through the same code as oma.admin_twilio action send (support Messaging Service, so replies land in the desk).
• After sending, add an internal note on the ticket: SMS sent to +358… (N parts): <text>, written by the staff member who sent it. Twilio errors go to the error log and show inline.

Rules to follow

• Product DoD (.cursor/rules/product-dod.mdc): staff MCP covers it. oma.admin_twilio send exists; add an optional ticketId so the MCP send also writes the internal note. Add oma.admin_ticket_draft mode: "sms" for the Moira short draft.
• en/fi/sv native strings, no em/en dashes. Customer copy names no vendors or hosts.
• UI style: card in the existing right sidebar, shadow card, no new tab row.
• Moira no credit burn: the template is the default. Test Moira with one live call at most.
• No auto-SMS on every reply. This is manual, per ticket.
• Handbook: add a line to apps/web/content/admin-docs/support/support.md (Twilio section).

Later (not in this issue)

Auto SMS for urgent tickets on staff reply, a one-time reminder SMS when the customer has not opened a staff reply in 24 h, and a customer opt-in toggle "SMS me when support replies".

Done when

• The card shows on a live ticket with the phone filled in. The template draft is correct for a fi and an en client.
• One real SMS is sent from the card, the internal note appears, and the MCP send with ticketId works live.
• Tests for the template builder and the note. Typecheck and i18n checks pass, and the deploy plus public smoke pass.