The TV quick-connect was rendered as standalone cards inserted between two
sliced block lists, which broke the panel's chosen style (e.g. split the
timeline rail) and dropped a step. Now it renders THROUGH the active renderer:
- Blocks gain an optional customNode; every renderer (cards/timeline/accordion/
minimal) drops it into the block body, so it inherits that exact style.
- InstallationGuide renders the FULL block list in the active style and injects
the TV connect widget as customNode on the "add subscription" step (no more
slicing / dropped steps) — only for the Happ Android TV app.
- TvQuickConnect is now content-only (no one-off cards/titles); the block step is
the wrapper. Buttons already use the shared blockButtonClass.