fix(settings): include the Session tabs toggle in the General page's visible list

The General section renders OpenChamberVisualSettings with an explicit
visibleSettings allowlist, so the new control was searchable but never
rendered.

packages/ui/src/components/sections/openchamber/OpenChamberPage.tsx

@@ -152,6 +152,7 @@ const GeneralSectionContent: React.FC = () => {
             {!isVSCode && <OpenChamberToolsSettings />}
             <OpenChamberVisualSettings visibleSettings={[
                 'fileEditorKeymap',
+                ...(!isVSCode ? ['sessionTabs' as const] : []),
                 'autoSaveEnabled',
                 'expandedEditorToolbar',
                 ...(!isVSCode ? ['terminalQuickKeys' as const] : []),