shell lives in
index.html so toggle targeting by id keeps working). Included inline for the
selected folder (active highlight + auto-expand must work on full load) and
served by /tree/folder-feeds/{folder_id} for every other folder, fetched on
first expand — inlining all folders' rows costs megabytes at thousands of
feeds. Context: row, folder_feeds, selected_feed_url, push_feed_urls,
_tree_sq, _tree_rfq. #}
{% for feed in folder_feeds %}