Improve Multi-line Input: "Enter" for New Line, Especially on Mobile

Sometimes, when interacting with ai agent, a user need to put multiple lines answer. Currently, in Agent Chat interactions, pressing the "Enter" key submits the input. To create a new line, users must use "Shift+Enter" on desktop (and can’t be done in mobile).

I propose the following changes to improve the UX for multi-line inputs:

• Mobile (Highest Priority): The "Enter" key (or equivalent "Return" key on the virtual keyboard) should create a new line. Submission must be handled by a distinct, visible "Submit" button/icon (similar to how you have it in WhatsApp or Telegram)

• Desktop (Recommended Default): "Enter" key creates a new line. Submission is handled by button. Or having a keyboard shortcut: Ctrl+Enter (for Windows/Linux) or Cmd+Enter (for Mac).