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>

app/Http/Controllers/PartLabelsController.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Models\Tenant\Part;
+use chillerlan\QRCode\QRCode;
+use chillerlan\QRCode\QROptions;
+use Illuminate\Http\Request;
+
+class PartLabelsController extends Controller
+{
+    public function sheet(Request $request)
+    {
+        $ids = array_filter(array_map('intval', explode(',', (string) $request->query('ids', ''))));
+        if (empty($ids)) abort(400, 'No parts selected.');
+
+        $parts = Part::whereIn('id', $ids)->orderBy('name')->get();
+
+        $opts = new QROptions([
+            'outputType' => QRCode::OUTPUT_MARKUP_SVG,
+            'eccLevel' => QRCode::ECC_M,
+            'scale' => 4,
+            'imageBase64' => false,
+            'addQuietzone' => true,
+        ]);
+
+        $labels = $parts->map(function (Part $p) use ($opts) {
+            $payload = 'PART:' . ($p->article ?: $p->id);
+            return [
+                'part' => $p,
+                'svg' => (new QRCode($opts))->render($payload),
+                'payload' => $payload,
+            ];
+        });
+
+        return view('parts.labels', ['labels' => $labels]);
+    }
+}