Release 5.5.0

Also stops one benign libmpv message being logged as an error: `after
creating texture: OpenGL error INVALID_ENUM` comes from the GL driver, arrives
several times per playback start and per fullscreen toggle, and playback
continues regardless. Hundreds of lines a session buried the errors that
matter -- it is a debug line now.

Verified end to end on the real display with an actual video playing: ten tab
switches and four fullscreen toggles while frames were rendering, position
advancing throughout, the render context intact, no crash, and an empty error
log afterwards.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "sagetube"
-version = "5.4.0"
+version = "5.5.0"
 description = "Watch-first YouTube client with embedded mpv playback and yt-dlp downloading. Fork of YTSage."
 authors = [
     { name = "Houmeres", email = "admin@ecoposta.sk" },