- Extract app list read/write into a dedicated RenderJS gadget
  (gadget_app_list_store.html/js) using jIO local storage, replacing
  duplicated inline code across import, compare, templates, and app_list
- Delete app: two-step confirm — remove from list only, or also wipe all
  IndexedDB files for that domain via crib_sw_setCribEnableGadgetUrl loop
- Import merge mode: add both staging and merge_workspace entries to app
  list (previously only merge_workspace was registered)
- Compare validate/cancel merge: catch readAppList errors and show a
  confirm dialog so the user can proceed with an empty list or abort,
  instead of the error blocking the update silently
- Filter both merge_url and staging_url from app list on merge completion

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>