fix(translator): remove unused slug='testbench' phantom prop (BUG-NOVO-1)

TestBenchAccordionProps extends Omit<AdvancedAccordionProps, 'slug'> so slug
is not a valid prop on that component. The slug is fixed internally as
'testbench' — callers must not pass it.

src/app/(dashboard)/dashboard/translator/TranslatorPageClient.tsx

@@ -133,7 +133,6 @@ function TranslatorPageClientInner() {
         onOpenChange={makeOpenHandler("streamtransform")}
       />
       <TestBenchAccordion
-        slug="testbench"
         forceOpen={state.advanced === "testbench"}
         onOpenChange={makeOpenHandler("testbench")}
       />