Fix: mobile enter inserts newline

[ferstar]

Summary

• Mobile enter no longer sends; inserts newline instead

Testing

• Not run (UI change only)

[github-actions]

Findings

• None

Summary

• No issues found in added/modified lines
• Residual risk: behavior change not validated on touch devices with soft/hardware keyboards; no web tests

Testing

• Not run (automation)

HAPI Bot

[github-actions]

Findings

• None

Summary

• No issues found in added/modified lines
• Residual risk: behavior change not validated on touch devices with soft/hardware keyboards; no web tests

Testing

• Not run (automation)

HAPI Bot