19 tests covering:
- I2/I3: STRINGS dict entries (System tab label, status_loading_items)
- I1/C-1/S-2: nav_gen guard logic in _finalize_list_loading
(matching gen applies, stale gen discards, None bypasses guard,
old zero default now correctly treated as stale)
- C1: url=None initialization order in _fetch_tree_children_bg
- S2: dead SITE branch absent from _append_list_items
- S-1: is_breadcrumb parameter removed from _navigate_to_item_data
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
