When making a new forum post, Enter should just newline, and not post

Reproduction steps

Find a forum channel
Click + New Post
Add a title
Start typing a message to start the forum post
Press enter

Expected behaviour

While keyboard focus is on the message area of creating a new forum post, it should add a newline.

Actual behaviour

While keyboard focus is on the message area of creating a new forum post, it just posts the message as if you had clicked the Post button.

Platform

Linux

Evidence

Canary Desktop 2026.1009.45608, Web 2026.1011.165018, Linux 7.2.9-200.fc44.x86_64 (x64), Electron 44.4.1, Chrome 152.0.7977.78, Node 24.21.0, Locale en-US