TellyGrid v0.4.0-alpha.4

Alpha 4 fixes the three main TV issues:

• Freeview channels play through the television tuner inside TellyGrid; one Back press returns to the guide. Verified on a 2021/22 Philips Android 11 Freeview Play TV.
• NOW rows now send channel-specific live-TV links instead of opening the home page. Sky Atlantic was verified end to end; a suitable membership and profile are still required.
• The catalogue now contains 78 channels, including the current Sky One lineup, Sky News, the remaining NOW Kids channels, and the full discovery+ UK entertainment lineup.
• The hosted Sky guide has been refreshed. HGTV remains visible with a listings-unavailable placeholder because the Sky source has no HGTV schedule.

This remains a development-signed sideloading alpha. Tuner support on non-Philips televisions is not yet verified, and discovery+ still uses app handoff rather than channel-specific links.