Add tmux terminal shortcut controls

README.md

@@ -18,7 +18,8 @@ APIs directly:
 - native API action center for health, server status, timeline, preferences,
   kanban projects, group messages, hook events, image file/URL upload, image
   preview info, and native image preview display
-- mobile soft-key row for tmux-oriented input
+- mobile soft-key row for tmux-oriented input, including tmux prefix, detach,
+  new window, previous/next window, Ctrl keys, arrows, page keys, and paste
 - automatic update checks against a GitHub Release manifest
 - APK download, SHA-256 verification, and installer handoff
 
@@ -101,6 +102,10 @@ escape filtering. It is enough for shell-oriented remote testing, but it is not
 yet a complete xterm-compatible renderer for full-screen TUIs such as `vim` or
 `top`.
 
+The terminal toolbar and shortcut row include tmux prefix helpers. The app sends
+the same control bytes a keyboard would send, for example `Ctrl+B`, `Ctrl+B d`,
+`Ctrl+B c`, `Ctrl+B n`, and `Ctrl+B p`.
+
 All app features are native Android controls. Complex server objects such as
 kanban projects, preferences, timeline events, group messages, and image metadata
 currently use native forms plus native JSON detail dialogs; image preview uses a