Set left on the remote to last channel

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

docs/roadmap.md

@@ -75,7 +75,7 @@ Paul's idea, 1 November 2026, for after the 25 channels work. Proposed, not buil
 
 - **Home:** keep the colour scheme and refine the details. Old-Sky-style category list on the left (All Channels, Documentaries, Movies, Kids and so on), showing a category only if the viewer has channels in it. Right side shows what's on now and OrbitOffice events, selectable with the remote.
 - **Guide:** choosing a category opens its channel list below, with channel name, time and what's on. Live picture-in-picture sits at the top on one side, with the highlighted programme's description on the other. Moving through the list updates the description, and only pressing OK changes the picture.
-- **Watching controls:** OK shows the classic programme bar. Up and down change channel. Right opens subtitles. Holding OK opens a small box for typing a channel number, because the Xiaomi remote may have no number keys. Left is unassigned; last channel is proposed.
+- **Watching controls:** OK shows the classic programme bar. Up and down change channel. Right opens subtitles. Holding OK opens a small box for typing a channel number, because the Xiaomi remote may have no number keys. Left jumps back to the last channel watched.
 - **Settings:** a gear at the top right holds connection, profiles, themes and editing, so setup stays out of the way.
 - **Loading:** today's menus are developer test screens. Replace them with simple viewer options behind the gear, once indexing is settled.
 - **Principle:** the TV should open onto something playing or one press away, so home can't become another catalogue.