Make Flatpak updates unmistakable after clients were stuck on the
May 1.0.3 commit. Expose bearwaveVersion/bearwaveBuildId to QML and
set the flatpak manifest version explicitly.
Restore the Flatpak manifest to the repo and target org.kde.Platform
6.10 instead of the EOL 6.6/23.08 stack reported in issue #5.
Add a maintainer build script and a CI job that verifies the manifest
builds against the current KDE SDK.
