floret-kit 0.7.0 pulls in material3 1.5.0-alpha29 on the runtime
classpath while the app still compiled against alpha21. alpha29 removed
the composable-content ButtonGroup overload, so the stopwatch and timer
controls threw NoSuchMethodError as soon as a tab opened.
Align the Compose BOM, material3, core-ktx and appcompat with
floret-kit 0.7.0, and make each variant's compile classpath resolve
consistently with its runtime classpath, so a future skew fails the
build instead of a user's app. The two ButtonGroups never used
animateWidth, so they become a Row with the group's spacing; the
removed ToggleButtonDefaults.shapes() was the default anyway.