Feature Request: Shift+Enter to insert newline in prompt input

Description

Currently, pressing Enter in the prompt input submits the message. To insert a newline, users must use Ctrl-J or Alt-Enter.

However, Shift+Enter has become the universal standard across modern chat interfaces (ChatGPT, Claude, Discord, Slack, etc.) for inserting a new line without submitting. Muscle memory from these platforms makes the current kimi-cli behavior feel unintuitive.

Current Behavior

Desired Behavior

Why This Matters

• Muscle memory: Millions of users are trained on Shift+Enter from web chat UIs. Supporting it reduces friction for new CLI users.
• Ergonomics: Shift+Enter is easier to discover and type than Ctrl-J or Alt-Enter.
• Parity: Aligns kimi-cli with the de-facto standard behavior users expect.

Environment

• kimi-cli version: latest
• OS: macOS (but applies to all platforms)

Thanks for considering this!

Start by locating the prompt input's keyboard handling and reproduce the current Enter, Ctrl-J, and Alt-Enter behavior in kimi-cli. Add Shift+Enter as another newline shortcut while preserving Enter submission and the existing alternatives, then verify the behavior interactively on the CLI.