[Feature request] Show more "Not loaded" info

[ralencode]

Checklist

• I believe this feature request will benefit more than 10% of users, not just myself
• I have searched for existing issues (open and closed) and confirmed this feature hasn't been requested before

Feature Description

i have one channel that is never loaded successfully, but i have no way of identifying it. all my 85 subscriptions are shown correctly in the "Subscriptions" tab, but when i refresh/update new videos - 1 is still not loaded, however many times i refresh. please add a way to view the channels that are not updated, maybe on a long tap on the "Feed last updated: moments ago\nNot updated: 1" label