Update session, AppStream, service, shell metadata, and initial setup about/defaults to use SHIFT-facing product metadata while keeping runtime package IDs and executable names stable. Install Shift AppStream metadata and remove stale upstream metainfo from existing prefixes. Add a guard for product metadata branding.
Detect the device class, stage the selected experience, and write the resulting setup choices through SetupState.
Load the new device and experience modules before the existing setup pages, and use the Shift icon on the finished page.
This (partially) reverts commit 127bbdf653.
Only incorrect changes from Kirigami.Units.largeSpacing to
Kirigami.Units.gridUnit are reverted. Only Plasma.Units were buggy.
Adds an experience for users on first login, allowing some basic configuration.
This is separate from a first start wizard, which would run as a separate user with elevated permissions, and include options that an installer would have.
