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+---
+phase: "02-admin-area-interactive-features"
+plan: "03"
+subsystem: "admin-workspace"
+tags: [admin, tabs, server-actions, phases, tasks, payments, documents, comments]
+dependency_graph:
+  requires: ["02-02"]
+  provides: ["admin-client-workspace", "getClientFullDetail", "client-detail-mutations"]
+  affects: ["admin-area", "client-data-management"]
+tech_stack:
+  added:
+    - "@radix-ui/react-tabs ^1.1.13 — tab primitive for client workspace"
+    - "shadcn/ui tabs component — src/components/ui/tabs.tsx"
+  patterns:
+    - "Inline Server Action closures in RSC props (action={async (fd) => { 'use server'; ... }})"
+    - "getClientFullDetail() — waterfall DB query assembling full client data in one call"
+    - "Server-side allowlist validation on all status mutations before db.update()"
+key_files:
+  created:
+    - src/app/admin/clients/[id]/page.tsx
+    - src/app/admin/clients/[id]/actions.ts
+    - src/components/admin/tabs/PhasesTab.tsx
+    - src/components/admin/tabs/PaymentsTab.tsx
+    - src/components/admin/tabs/DocumentsTab.tsx
+    - src/components/admin/tabs/CommentsTab.tsx
+    - src/components/ui/tabs.tsx
+  modified:
+    - src/lib/admin-queries.ts
+    - package.json
+    - package-lock.json
+decisions:
+  - "Inline Server Action closures capture clientId/phaseId/taskId from RSC scope — no cross-client pollution (T-02-14)"
+  - "approved_at immutability enforced by omission in addDeliverable — field not set in insert, never updated"
+  - "quote_items never queried in getClientFullDetail — accepted_total is the only price surface returned"
+  - "params in Next.js 16 App Router must be awaited (Promise<{ id: string }>) — applied as deviation fix"
+metrics:
+  duration_minutes: 25
+  completed_date: "2026-05-15"
+  tasks_completed: 2
+  tasks_total: 2
+  files_created: 7
+  files_modified: 3
+---
+
+# Phase 2 Plan 03: Admin Client Workspace (Tabs) Summary
+
+**One-liner:** Full-featured admin client workspace with Radix Tabs covering phases/tasks, payments, documents, and comments — all mutations via inline Server Actions with server-side validation.
+
+## What Was Built
+
+The `/admin/clients/[id]` route delivers a complete project management workspace for the admin. Four tabs cover every concern of a client's lifecycle:
+
+- **Fasi & Task** — Add phases and nested tasks, update phase/task status with select dropdowns
+- **Pagamenti** — Edit `accepted_total` (auto-splits to 50% per payment row), update payment status (sets `paid_at` on saldato)
+- **Documenti** — Add document links (label + external URL) and delete them
+- **Commenti** — Read all client/admin comments chronologically; post admin replies against any task or deliverable
+
+All mutations are Server Actions in `src/app/admin/clients/[id]/actions.ts`. The page calls `getClientFullDetail()` which assembles client + phases + tasks + deliverables + payments + documents + notes + comments in a single waterfall query sequence.
+
+## Tasks Completed
+
+| Task | Name | Commit | Key Files |
+|------|------|--------|-----------|
+| 1 | Install tabs, add getClientFullDetail, create Server Actions | 7733566 | package.json, admin-queries.ts, [id]/actions.ts, ui/tabs.tsx |
+| 2 | Build detail page and all four tab components | 59a46d3 | [id]/page.tsx, PhasesTab, PaymentsTab, DocumentsTab, CommentsTab |
+
+## Deviations from Plan
+
+### Auto-fixed Issues
+
+**1. [Rule 1 - Bug] Next.js 16 params must be awaited**
+- **Found during:** Task 2
+- **Issue:** In Next.js 16 (project uses 16.2.6), dynamic route `params` is a `Promise<{ id: string }>` not a plain object. The plan's template used `params.id` directly which would fail at runtime.
+- **Fix:** Changed page signature to `params: Promise<{ id: string }>` and added `const { id } = await params;` before use.
+- **Files modified:** src/app/admin/clients/[id]/page.tsx
+
+**2. [Rule 2 - Missing critical functionality] Explicit TypeScript types on Server Action closure params**
+- **Found during:** Task 2
+- **Issue:** Inline closures `async (fd) => { "use server"; ... }` lacked explicit `FormData` type annotation, which could cause TypeScript inference issues.
+- **Fix:** Added explicit `: FormData` type annotation on all closure parameters.
+- **Files modified:** PhasesTab.tsx, PaymentsTab.tsx, DocumentsTab.tsx, CommentsTab.tsx
+
+## Architecture Constraints Respected
+
+- `clients.token` — Read-only in this plan. Never used as primary key.
+- `quote_items` — Not queried anywhere in this plan. `accepted_total` is the only price value exposed.
+- `deliverables.approved_at` — Enforced by omission: `addDeliverable` inserts `status: "pending"` with no `approved_at` field.
+- Two independent auth paths — Admin workspace is under `/admin/*`, protected by middleware session from Phase 2 Plan 01.
+
+## Security Notes (Threat Register Mitigations Applied)
+
+- **T-02-10:** `updateTaskStatus` and `updatePaymentStatus` both validate status against an allowlist before any `db.update()` call.
+- **T-02-11:** `deleteDocument` is only reachable through admin-protected routes; no client can reach it without a valid Auth.js session.
+- **T-02-13:** `postAdminComment` parses the composite `"type:id"` entity value and validates `entity_type` is exactly `"task"` or `"deliverable"` before insert.
+- **T-02-14:** Inline closures capture `clientId`, `phaseId`, `taskId` from the Server Component's own scope, preventing cross-client data pollution.
+
+## Known Stubs
+
+None — all data is live from the database via `getClientFullDetail()`.
+
+## Threat Flags
+
+None — no new network endpoints, auth paths, or schema changes introduced beyond what the plan's threat model covers.
+
+## Self-Check
+
+- [x] src/app/admin/clients/[id]/page.tsx exists
+- [x] src/app/admin/clients/[id]/actions.ts exists
+- [x] src/components/admin/tabs/PhasesTab.tsx exists (153 lines > 60 min)
+- [x] src/components/admin/tabs/PaymentsTab.tsx exists (96 lines > 40 min)
+- [x] src/components/admin/tabs/DocumentsTab.tsx exists
+- [x] src/components/admin/tabs/CommentsTab.tsx exists
+- [x] Commit 7733566 exists (Task 1)
+- [x] Commit 59a46d3 exists (Task 2)
+- [x] npm run build passes cleanly
+
+## Self-Check: PASSED
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