It is possible to leave the URL field blank for a link channel

Reproduction steps

Create a link channel (you have to enter some url on link channel creation)
Edit the link channel
Erase the contents of the URL field and save

Expected behaviour

You shouldn't be able to save when there is no URL in the field

Actual behaviour

While you can't create a link channel with a blank URL, you can edit a link channel to have a blank URL field. This leads to some unexpected behavior as a result, which I could report separately if this is intended, but I have a feeling it isn't.

Build information

Canary Desktop 2026.1025.12532, Web 2026.1025.194914, Linux 7.2.11-200.fc44.x86_64 (x64), Electron 44.9.1, Chrome 152.0.7977.167, Node 24.22.0, Locale en-US Version 2026.10.100, Beta 12, Channel Beta, Build 2817, Android 16 (arm64), Device Google Pixel 9a, Locale en-US, Push fcm, Flutter 3.47.8, Dart 3.13.7

Platform

macOS, Windows, Linux, Web, Android, iOS