The updates overlay (status-bar version click) showed no channel, so a
source install could not tell it was pinned to stable releases.
- VersionDetails (shared by About and the overlay) gains a Channel row for
source checkouts: "Stable releases", "Every commit (main)", or
"Branch: <name>". Packaged installs render no row; their channel is the
package's.
- The overlay passes a "Change" link that closes the dialog and deep-links
to Settings > About > Updates, where the selector and its confirm step
live. The channel is not switchable from the overlay itself.
- Current on stable, the status line names the release ("You're on the
latest stable release (v0.21.6)."). A forward-only checkout ahead of the
release keeps the generic line: source_check now reports
`aheadOfRelease`, since its pinned target is HEAD and would otherwise
look identical to being on the release.
573f514a19