fix: central company view page 404 + broken stats query

The /admin/companies/{id} view page (ViewCompany extends Page) 404'd because
the {record} route param could arrive as a JSON-encoded model (Livewire typed-
property hydration), so findOrFail() received a non-id and threw
ModelNotFoundException. Added resolveRecordKey() to normalize scalar id / model
/ JSON-string down to the integer key.

Also fixed getStats() referencing non-existent parts columns `stock` /
`low_stock_threshold` (real columns are `qty` / `min_qty`), which would 500 the
page once mount resolved.

Added CentralCompanyViewTest as regression (asserts 200 + company name). Full
suite: 100 passed.

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

app/Filament/Central/Resources/CompanyResource/Pages/ViewCompany.php

@@ -27,7 +27,27 @@ class ViewCompany extends Page
 
     public function mount(int|string $record): void
     {
-        $this->record = Company::with(['plan', 'subscriptions' => fn ($q) => $q->latest('period_end')->limit(10)])->findOrFail($record);
+        // The {record} route param may arrive as a scalar id, an Eloquent model,
+        // or (via Livewire's typed-property hydration) a JSON-encoded model.
+        // Normalize all of these down to the integer primary key.
+        $key = $this->resolveRecordKey($record);
+
+        $this->record = Company::with(['plan', 'subscriptions' => fn ($q) => $q->latest('period_end')->limit(10)])
+            ->findOrFail($key);
+    }
+
+    private function resolveRecordKey(mixed $record): int|string
+    {
+        if ($record instanceof Company) {
+            return $record->getKey();
+        }
+        if (is_string($record) && str_starts_with(ltrim($record), '{')) {
+            $decoded = json_decode($record, true);
+            if (is_array($decoded) && isset($decoded['id'])) {
+                return $decoded['id'];
+            }
+        }
+        return $record;
     }
 
     public function getTitle(): string
@@ -50,8 +70,8 @@ class ViewCompany extends Page
             'work_orders_open' => WorkOrder::whereNotIn('status', ['done', 'cancelled'])->count(),
             'parts' => Part::count(),
             'parts_low_stock' => Part::where('is_active', true)
-                ->whereColumn('stock', '<=', 'low_stock_threshold')
-                ->where('stock', '>', 0)
+                ->whereColumn('qty', '<=', 'min_qty')
+                ->where('qty', '>', 0)
                 ->count(),
             'revenue_this_month' => (float) Payment::whereYear('paid_at', date('Y'))
                 ->whereMonth('paid_at', date('m'))->sum('amount'),