Display the view options button, channel menu, and content type tabs
immediately when the cached header is shown, instead of waiting for
the full channel data to load. The spinner now appears only in the
content area below the tabs.
Adds a "Proxy videos" toggle in instance settings that routes video
streams through the instance instead of connecting directly to YouTube
CDN. Includes auto-detection of 403 blocks and live re-application of
proxy settings without requiring app restart or video reload.
Shows an orange "DEV" capsule next to the iCloud row in Settings and a
development environment notice at the top of iCloud settings, helping
distinguish CloudKit dev environment from production during development.
