v2.9.78

• Add optional Couchside Themes (Beta), with console-style layouts, a theme picker and Theme Studio. Themes remain off until applied, and Steam's normal home can be restored.
• Expand supported lighting effects and editable sequences, including supported handheld ring controls. Available effects depend on the lighting hardware.
• Add the optional Couchside Player sample-film prototype, with playback progress, pause, seek and stop controls from the phone.
• Includes 2.9.133's clearer Couch Mode explanations and the earlier secure-connection, private file-upload and controller-diagnostic improvements. Existing pairing and controls remain compatible.