T YouTube Zversion test-zversion-3

Optional Zversion 3 preview built from stable v1.0.1 at commit 6248bd0. Fixes the hidden-to-visible guard that stopped the Shorts brand loop from starting, registers the layout listener that made the fullscreen watermark stay invisible, restores the video title as the download filename (v1.0.1's empty-name check was inverted, so every file was called 'download'), keeps automatic duplicate naming via createUniqueFile, keeps the controls-only watermark in BOTH bottom-control layouts, and adds a 'Zversion 3' marker on the About screen so the installed build is easy to identify. Package, version code and AOSP testkey signature are unchanged, so it installs over v1.0.1 with data intact. Not a stable release - stable v1.0.1 remains the recommended download. See T-YouTube-Zversion-TEST-README.txt for the checklist.