fix: resolve INK2/NE entity_type from companies table fallback (#217)

* fix: resolve INK2/NE entity_type from companies table fallback (#193)

The entity_type check in INK2 and NE-bilaga engines read from
company_settings where it is nullable, causing "only for aktiebolag"
errors when the column is null. Now falls back to companies.entity_type
(NOT NULL, always set). Reports page uses useCompany() context instead
of /api/settings for tab visibility.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: address Greptile review — surface fallback errors, avoid direct mutation

- Surface Supabase errors in entity_type fallback queries instead of
  silently swallowing them (ink2-engine, ne-engine)
- Use spread instead of direct mutation on Supabase result object
  (settings route)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: use separate variable to avoid const reassignment in settings route

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/api/settings/route.ts

@@ -26,7 +26,20 @@ export async function GET() {
     return NextResponse.json({ error: error.message }, { status: 500 })
   }
 
-  return NextResponse.json({ data })
+  // Fall back to companies.entity_type if company_settings.entity_type is null
+  let responseData = data
+  if (data && !data.entity_type) {
+    const { data: company } = await supabase
+      .from('companies')
+      .select('entity_type')
+      .eq('id', companyId)
+      .single()
+    if (company?.entity_type) {
+      responseData = { ...data, entity_type: company.entity_type }
+    }
+  }
+
+  return NextResponse.json({ data: responseData })
 }
 
 export async function PUT(request: Request) {