4.15.4

🐛 Fixes

• Conference deep links now open in a dedicated call window. Conference links that carry only a conference id (e.g. conference/<id>, without an explicit call URL) previously loaded the conference over the workspace webview, leaving no way back to the workspace. These links now open the conference in the standalone video call window, so closing it returns you to an untouched workspace. Links that already include an explicit call URL are unchanged. (#3412)

🔧 Internal

• CI: run pull-request build and validation workflows for hotfix/** base branches.