The Channel manager's tab (subscriptions vs playlist discovery) was persisted
locally, so the header's "N without full history" link and the focus-channel
jump (subscribe notice, tag manager) could dump the user on the Discovery tab
while quietly applying a status/name filter that only affects the subscriptions
table — the targeted channel was there, just on the hidden tab.
Lift the tab state to App alongside the status filter it pairs with, and have
those navigation intents switch it back to "subscribed".