fix: show context-aware JSON editor hint and hide quick toggles for non-active providers

The hint text and ClaudeQuickToggles were misleading when editing
non-current providers or creating new ones, since the editor only
contains a config snippet rather than the full live settings.json.

src/components/providers/EditProviderDialog.tsx

@@ -192,6 +192,7 @@ export function EditProviderDialog({
         onCancel={() => onOpenChange(false)}
         initialData={initialData}
         showButtons={false}
+        isCurrent={liveSettings !== null}
       />
     </FullScreenPanel>
   );