Stage 7+14 — Mechanic Board + Scan Center

Mechanic Workflow (Stage 7):
- /app/mechanic Filament page filtered to master_id = auth user
- Kanban 4 columns (in_work / awaiting_parts / ready / recent), each card
  shows WO#, plate, client, complaint summary, photo presence
- 2 KPI tiles (active now / closed today)
- Mobile-responsive grid (auto-fit, minmax 260px)

WarehouseService:
- issueNow(WorkOrderPart) — consume reservations immediately scoped to one
  line, without closing the WO (mechanic physically takes part now)
- returnPart(WorkOrderPart, qty?, notes?) — refund to stock as new batch
  at original buy_price, writes `return` event, capped at consumed total

WO PartsRelationManager:
- "Eliberează" action — visible when active reservation exists
- "Restituire" action — visible when consumed reservation exists, with qty
  modal + notes

Scan Center (Stage 14):
- PartResource "QR" action — per-part SVG QR with payload PART:<article|id>
- BulkAction "Tipărește etichete QR" → /parts/labels?ids=N,M (HTML A4 sheet,
  3-col grid, print CSS hides toolbar)
- /app/scan Filament page using html5-qrcode 2.3.8 (CDN), auto-picks back
  camera, decodes → Livewire dispatches scanner-decoded → resolveAndRedirect
- Lookup matches PART:N prefix, parts.article, parts.barcode, or numeric id
- Manual input fallback for browsers without camera

Tests (6 new):
- WarehouseIssueReturnTest (3): issueNow consumes immediately; returnPart
  creates positive batch + return event; over-return is capped
- ScannerLookupTest (3): PART: prefix lookup, raw barcode lookup, unknown miss

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

routes/web.php

@@ -57,6 +57,12 @@ Route::get('/login', function (Request $request) {
     return redirect($tenant ? '/app/login' : '/admin/login');
 })->name('login');
 
+// ─── Print sheets (auth required, tenant-scoped) ───────────────────
+Route::middleware(['web', 'auth'])->group(function () {
+    Route::get('/parts/labels', [\App\Http\Controllers\PartLabelsController::class, 'sheet'])
+        ->name('parts.labels');
+});
+
 // ─── Telegram webhook (per-tenant, on central domain) ──────────────
 Route::post('/telegram/webhook/{slug}', [\App\Http\Controllers\TelegramWebhookController::class, 'handle'])
     ->where('slug', '[a-z0-9\-]+')