Values inside the Experiment configuration banner now show the same
pending color as the motor move boxes while the typed text differs from
the applied value; Enter (or focus-out) commits as before and clears it.
Opt-in via NumberLineEdit(track_pending=True) because MotorMoveGroup
owns the movestate property on its registered boxes; reuses the existing
movestate QSS, so no new styling. The Set Energy spinbox marks pending
until Change Energy is clicked, since its apply gate is the button.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>