Build a page: Support & ticketing (help-desk ticketing system)

Route: /support (client page — metadata in a sibling layout.tsx)
Nav: add to nav-config.ts under the "shadcn/ui" section.
Page frame: flex h-full flex-col -> action header with <Breadcrumbs/> ->
content min-h-0 flex-1 (three-pane inside one card, p-4).

This is a ticketing system, NOT a chat. Three regions:

- Left (w-80, border-r): ticket queue. Search Input (subject / ref /
  requester) + a status-filter Select over a scrollable list. Each row:
  subject, status badge, priority dot, ref (TCK-####), requester, updated.
  Active row tinted bg-accent.
- Center: detail header (status badge, ref, subject) -> the original request
  -> a stacked ACTIVITY TIMELINE (avatar + author + role + time + text, each a
  bordered card, all left-aligned — not left/right chat bubbles) -> a reply
  textarea + "Send reply" button. Sending appends a comment and sets status
  -> Pending.
- Right (w-60, border-l, hidden < lg): properties rail — editable status +
  priority Selects, requester, assignee, last updated.

Data model:
Status = "open" | "pending" | "resolved"
Priority = "low" | "medium" | "high" | "urgent"
Comment { id, author, role: "agent" | "customer", text, time }
Ticket { id, ref, subject, requester, assignee, status, priority, updated,
description, comments: Comment[] }

Colors: status badges + priority dots use static Tailwind classes keyed by
value (same convention as TAB_COLORS / calendar labels), light+dark.
Building blocks: Input, Select, Button, cn, Breadcrumbs, SetPageTitle, date-fns.
The queue is buttons; for sorting/columns/bulk actions switch to
RecordView (see /docs/data-table). No table/chat dependency.

Test scenarios (happy / unhappy):
TC-1 Select a ticket -> detail + activity + properties switch, row active
TC-2 Change status / priority -> Select updates the ticket + badge/dot
TC-3 Filter by status -> queue narrows to that status
TC-4 Send a reply -> comment appended to timeline, status -> Pending
TC-5 Reply empty -> Send disabled, nothing added
TC-6 Search by ref/requester -> queue filters; empty -> "No tickets found."

Done when: queue + detail + properties render, search & status filter work,
status/priority editable, reply appends to the timeline, badge/dot colors from
the maps, the scenarios above pass, light + dark, a11y, lint + types + build pass.