build: rebrand output artifacts to Oak and fix macOS QML deployment

- Rename macOS bundle output from Olive.app to Oak.app.
- Rename editor binary to oak-editor and render worker to oak-render-worker.
- Rename crash handler output to oak-crashhandler.
- Update worker lookup, NSIS installer, Linux desktop/AppRun, crashhandler
  symbol paths, and documentation for the new binary names.
- Update CD workflow paths and add -qmldir flags to macdeployqt so QtQuick
  / QML plugins required by KDDockWidgets are bundled, fixing the launch
  crash on macOS.
- Update user-facing GitHub URLs to OakVideoEditorCommunity/oak.

app/packaging/linux/org.oakvideoeditor.Oak.desktop

@@ -4,7 +4,7 @@ Comment=Professional open-source non-linear video editor
 Comment[fr]=Éditeur vidéo non-linéaire open-source professionnel
 Comment[it]=Programma di montaggio video professionale open-source
 Comment[id]=Aplikasi edit video yang non-linier, profesional serta sumbernya terbuka.
-Exec=olive-editor %f
+Exec=oak-editor %f
 Icon=org.oakvideoeditor.Oak
 Terminal=false
 Type=Application