Feature/project edit, publish, and close actions

[dcl10]

Description

The project detail page is read-only. Users with the ManageProjects role should be able to edit a project's details, publish it from Draft to Open, and close it. All three backend endpoints already exist and are protected by the CanManageProjects policy.

Backend behaviour (already implemented):

Action	Endpoint	Returns	Notes
Edit details	PUT /api/projects/{id}	Project	Same fields as create (title, description, desiredTeamSize, timeline). 409 if invalid state.
Transition status	PUT /api/projects/{id}/status	Project	Body: { "status": "Open" | "TeamConfirmed" | "Closed" }. 409 if transition not allowed.
Close	DELETE /api/projects/{id}	204 No Content	Convenience wrapper — transitions project to Closed.

Valid status transitions:

• Draft → Open (publish)
• Open → Closed
• TeamConfirmed → Closed
• Closed → (nothing)

Auth: All actions require currentUser.role === "ManageProjects". Controls should only render for users with this role.

Patterns to follow:

• Server actions: app/projects/[projectId]/actions.ts (see existing submitForAnalysis action)
• Edit form: mirror frontend/app/projects/new/_CreateProjectForm.tsx (same four fields, pre-populated)
• API functions: add to frontend/lib/api/projects.ts using existing apiRequest / apiRequestNoContent helpers

Tasks

• Add updateProject(projectId, request, token), transitionProjectStatus(projectId, status, token), and closeProject(projectId, token) to frontend/lib/api/projects.ts
• Add updateProjectAction, publishProjectAction, and closeProjectAction server actions to frontend/app/projects/[projectId]/actions.ts; revalidate /projects/${projectId} on success
• Create frontend/app/projects/[projectId]/_EditProjectForm.tsx — client component, pre-populated with current values, same field set as _CreateProjectForm.tsx
• Update frontend/app/projects/[projectId]/page.tsx to fetch currentUser in parallel with project, derive canManage, and conditionally render:
  • Edit button / inline form (shown when project is Draft or Open)
  • "Publish" button (shown when status is Draft)
  • "Close project" button with a destructive confirmation (shown when status is not Closed)