Transcript view (Ctrl+O) does not respond to scroll keys

Summary

After opening the transcript view with Ctrl+O (app:toggleTranscript), none of the documented scroll keys respond — keyboard input appears to be ignored entirely. Reproduces both inside and outside tmux.

Environment

• Claude Code: 2.1.138 (native install)
• OS: Linux (proot-distro under Termux on Android), TERM=tmux-256color inside tmux, also reproduced in plain terminal outside tmux
• Shell: zsh 5.x

Steps to reproduce

1. Start claude in any project.
2. Have at least a few turns of conversation so there's content to scroll.
3. Press Ctrl+O — the transcript view opens correctly.
4. Press any of: j, k, Up, Down, Ctrl+U, Ctrl+D, Ctrl+B, Ctrl+F, g, G, Home, End.

Expected

The transcript scrolls per the documented Transcript / Scroll context bindings (scroll:lineUp, scroll:halfPageUp, etc.).

Actual

No response to any of those keys. View stays put. Esc / q / Ctrl+C do close the view, so some keys reach it — only the scroll keys are unresponsive.

Notes

• Reproduces outside tmux, so this is not a terminal-multiplexer/key-passthrough issue.
• /doctor reports no keybinding-related errors.
• Only customisation in ~/.claude/keybindings.json is in Chat context (space: null, meta+k: voice:pushToTalk) — nothing touching Transcript or Scroll.
• Possibly a context-mismatch: the docs/keybinding table list scroll actions under Transcript, but the fullscreen transcript view may actually be in the Scroll context (or neither is receiving keys).

Workaround

None found.