[Feature Request] Option to disable Enter key sending messages (use Shift+Enter or Ctrl+Enter instead)

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

Currently, pressing Enter in the claude.ai chat interface immediately sends the message. There is no built-in setting to change this behavior. For users who write longer, multi-line prompts, this is a significant friction point — it's easy to accidentally submit an incomplete message mid-thought.

Proposed Solution

Add a toggle in Settings that lets users choose their preferred send behavior:

Enter = new line, Ctrl+Enter or Shift+Enter = send (new option)
Enter = send (current default)

This is a standard UX pattern offered by tools like Slack, Notion, and Linear.

Alternative Solutions

_No response_

Priority

High - Significant impact on productivity

Feature Category

Interactive mode (TUI)

Use Case Example

_No response_

Additional Context

Why This Matters

Power users who write detailed, structured prompts are disproportionately affected
Accidental sends are disruptive and break flow
Third-party Chrome extensions already exist to work around this, indicating real demand
Multiple GitHub issues (#729, #2054, #14688, #26303) have been opened on this topic — consolidating into a proper feature request

Workarounds (current)

Use Shift+Enter for new lines (not intuitive)
Install a third-party Chrome extension

Neither is acceptable as a long-term solution. This should be a native setting.