feat: enhance frontend UI — command palette, admin redesign, API coverage

Types + API:
- Add User, TemplatePreview, QueueCustomField types
- Add getUsers, getTemplates, createTemplate, updateTemplate,
  previewTemplate, updateQueue, updateLifecycle, updateCustomField API functions

UI:
- Command palette: keyboard-first navigation with fuzzy ticket search
- Admin: comprehensive redesign with tab-based layout (Queues, Lifecycles,
  Scrips, Custom Fields, Templates, Users)
- Ticket list: improved inbox-style rows with quick actions
- Ticket detail: enhanced conversation thread and properties sidebar
- App shell: sidebar visual refinement with active indicator bar
- Theme toggle: smoother transitions

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

web/package-lock.json

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@@ -7217,6 +7284,16 @@
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