[BUG] Plugin details screen: arrow keys and Enter don't work for install scope selection

Description

On the /plugin → Discover → Plugin details screen, the install scope options (Install for user, Install for project, etc.) cannot be navigated or selected using keyboard.

Steps to reproduce

1. Run /plugin
2. Go to "Discover" tab
3. Select any plugin to view its details
4. Try to navigate the install options with up/down arrow keys → doesn't work
5. Try to press Enter to install → doesn't work

Expected behavior

Arrow keys should navigate the options, Enter should select/install.

Actual behavior

No response to arrow keys or Enter on this specific screen. The cursor appears stuck and no option can be selected.

Environment

• Claude Code version: 2.1.5
• Terminal: Ghostty
• OS: Arch Linux (kernel 6.18.3-arch1-1)

Additional context

• Keyboard navigation works correctly everywhere else in Claude Code (permission prompts, tab switching with left/right arrows, session resume, slash command menus, etc.)
• This issue is isolated to the plugin details screen install scope selection
• Ghostty keybindings only customize shift+enter and shift+space, regular arrow keys and Enter are default