Help screen (?) shows Shift+Return for multiline, but Option+Return is the actual macOS default

Description

There's a discrepancy between the keybinding hints shown in different parts of the UI on macOS:

• Tips shown during thinking: Correctly show Option+Return for multiline input
• Help screen (?): Shows Shift+Return for multiline input

Actual behavior

• Option+Return inserts a newline (works reliably across all macOS terminals)
• Shift+Return submits the message (behaves same as Return in most terminals)

The ? help screen is misleading — following its guidance causes the message to be sent instead of inserting a newline.

Expected behavior

The ? help screen should show Option+Return as the multiline shortcut on macOS, consistent with the tips and the actual default behavior.

Environment

• macOS (Darwin 24.6.0)
• Claude Code CLI