Inconsistent interaction behavior across different prompt types

Issue

The interaction model for selecting numbered options varies inconsistently across different prompt types, making the UI feel unpredictable:

1. Permission prompts (tool approvals): Pressing a number key immediately executes the selection
2. Single-select questions (AskUserQuestion): Pressing a number highlights the option, then requires Enter to confirm
3. Multi-select questions: Requires arrow keys to navigate, Space to toggle, Enter to confirm

Problem

As a user, when I see a numbered list of choices, I don't know which interaction model I'm in. Sometimes I press a number and it fires immediately, other times I press a number and nothing happens until I hit Enter, and other times I have to arrow down and then Enter. The behavior differences aren't visually communicated.

Suggestion

Standardize the interaction pattern, or at minimum provide clear visual cues indicating the expected input mode. For example:

• If auto-submit on keypress: show Press 1-3 to select
• If selection + confirm: show Select with 1-3, then press Enter
• If multi-select: show Space to toggle, Enter to confirm

Consistent behavior (e.g., always requiring Enter to confirm) would be the simplest fix and would prevent accidental immediate execution on permission prompts.