The full-screen button did nothing: WKWebView inside a Tauri window has
element fullscreen disabled outright, so both requestFullscreen() and
WebKit's webkitEnterFullscreen() are inert, and Tauri exposes no switch
for it. Fullscreening the window alone is not the same thing either —
the player's header and footer stay on screen around the picture. The
button now fullscreens the window and hides every piece of chrome, so
the video alone fills the display, with Esc and a hover control to exit.
Prev/next also get large arrows on the left and right edges of the
picture, fading in on hover, alongside the header buttons.
Refresh fetches 8 channel feeds concurrently and mirrors thumbnails to
disk so the offline feed still renders. Downloads are capped at 2 and
shell out to yt-dlp with an absolute binary path, since GUI apps do not
inherit a login shell PATH.
vincent