[AZ-512] Admin class inline edit form + PATCH wiring (cy4 batch 16)

Implements the cycle-3-deferred AZ-512 task under the user-authorized
Option B path (MSW-stubbed; live deploy gates at Step 16 on AZ-513).

Code:
- src/features/admin/AdminPage.tsx — inline edit affordance:
  editingId/editForm state, handleStartEdit/Cancel/Update, Enter+Escape
  keyboard handling, colspan row swap when editing, pencil (✎) button
  per row. Full-body PATCH (Risk 2). Single editingId enforces the
  one-row-at-a-time invariant (Risk 3). Disabled buttons during the
  in-flight PATCH (Risk 4). Inline role="alert" on validation/server
  errors (no alert() per Finding B4 anti-pattern).
- src/i18n/{en,ua}.json — `admin.classes` flat → nested with `title`
  + 6 new keys (edit, save, cancel, nameRequired,
  maxSizeMustBePositive, updateFailed). Parity gate FT-P-22 PASS.

Test infrastructure:
- tests/msw/handlers/admin.ts — PATCH /api/admin/classes/:id
  partial-merge handler.
- tests/admin_class_edit.test.tsx — 12 tests covering AC-1..AC-6
  + AC-8 (AC-7 satisfied by static FT-P-22 gate).
- tests/destructive_ux.test.tsx — adjacent-hygiene selector fix
  at 3 call sites: the new ✎ button moved the first-button
  position; targeting × explicitly preserves the existing
  it.fails()/control semantics.

Docs:
- _docs/02_document/components/08_admin/description.md — recorded
  edit affordance + PATCH wiring + AZ-513 cross-workspace note.
- _docs/03_implementation/batch_16_cycle4_report.md
- _docs/03_implementation/implementation_report_admin_class_edit_cycle4.md
- _docs/02_tasks/todo → done — AZ-512 archived.

Quality gates: 32 files / 243 tests / 13 quarantined skips PASS;
all 35 static checks PASS (FT-P-22/23, STC-ARCH-01/02, STC-SEC*,
banned-deps incl. SEC1B/C/D).

Cross-workspace dependency: admin/ AZ-513 (POST + PATCH + DELETE
/classes routes) NOT yet shipped. Step 11 (Run Tests) passes on
stubs; Step 16 (Deploy) holds until AZ-513 lands live. Leftover
record at _docs/_process_leftovers/2026-05-13_az-512-admin-
classes-prereq.md stays open.

Discovered pre-existing bug (NOT bundled): tests/msw/handlers/
admin.ts returns paginate(seedUsers) for GET /api/admin/users,
but AdminPage consumes as flat User[] → users.map crash. Test
files use the same flat-array workaround
destructive_ux.test.tsx documented. Flagged in batch + impl
reports for separate triage.

Co-authored-by: Cursor <cursoragent@cursor.com>

_docs/02_document/components/08_admin/description.md

@@ -14,7 +14,7 @@
 
 | Export | Notes |
 |--------|-------|
-| `AdminPage()` | Top-level route component. Sub-sections: Users, Detection Classes, AI Settings, GPS Settings, Aircraft default. |
+| `AdminPage()` | Top-level route component. Sub-sections: Users, Detection Classes, AI Settings, GPS Settings, Aircraft default. Detection Classes table supports the full CRUD surface — add, **edit** (AZ-512 inline form on row click of the ✎ button; PATCH `/api/admin/classes/{id}` with full body per Risk-2 mitigation; Enter saves, Escape cancels; inline validation for empty name and non-positive maxSizeM; closes Architecture Vision P12), delete. |
 
 ## 3. External API Specification
 
@@ -22,7 +22,7 @@
 |--------|------|---------|
 | GET / POST / PUT / DELETE | `/api/admin/users` | User CRUD |
 | GET | `/api/annotations/classes` | Read class list (note: read uses `annotations/`, write uses `admin/`) |
-| POST / PUT / DELETE | `/api/admin/classes` | Class CRUD |
+| POST / PATCH / DELETE | `/api/admin/classes` | Class CRUD. PATCH `/api/admin/classes/{id}` powers the inline edit affordance (AZ-512) and accepts a full or partial body of `{ name?, shortName?, color?, maxSizeM? }`. **Cross-workspace note**: as of AZ-512 ship, the live `admin/` service still owes the write routes (POST + PATCH + DELETE) per **AZ-513** on `admin/`; UI ships against MSW stubs until that lands. |
 | GET / PUT | `/api/admin/settings/ai` | AI service config |
 | GET / PUT | `/api/admin/settings/gps` | GPS device config |
 | GET / PUT | `/api/admin/settings/aircraft-default` | Aircraft default |