feat(frontend): sprint 5 — templates CRUD pages + nav + picker modal + dropdown
- types.ts: SimulationTemplate, SimulationTemplateCreateInput, SimulationTemplatePatchInput,
extend SimulationCreateInput with template_id
- api/templates.ts: listTemplates, getTemplate, createTemplate, updateTemplate, deleteTemplate
- hooks/useTemplates.ts: useTemplates, useTemplate, useCreateTemplate, useUpdateTemplate,
useDeleteTemplate (TanStack Query, invalidates ["templates"])
- TemplatesListPage: /admin/templates — table (name, MITRE count, created by, updated),
New/Edit/Delete actions, loading/error/empty states
- TemplateFormPage: /admin/templates/new + /admin/templates/:id/edit — controlled form
with inline MITRE field (picker + matrix modal), ConfirmDialog for delete
- TemplatePickerModal: reusable modal listing templates with empty state (AC-27.6)
- SimulationList: replace "New simulation" link with split-button dropdown
(Blank → /simulations/new | From template… → TemplatePickerModal + POST template_id)
- Layout: "Templates" nav link (admin | redteam, before "Users")
- App.tsx: /admin/templates routes gated roles=["admin","redteam"]
- 26 new Vitest tests (118 total, 92 original preserved)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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