Add DbOverrideLineEdit: a numeric field holding both a database value and
the user's value, driven by a per-tab Database/User-values toggle. The
user's value persists across samples, can be reverted to the database
value, and recovered again - replacing the clunky per-field checkboxes.
Fix the dtz<->resolution coupling so editing one updates the other in both
Database and User modes (previously it broke whenever a value was
overridden). Wire resolution, detector distance, transmission, exposure,
rotation total/image angle and the raster grid element size through the
new widget; other panels are untouched.
Add tests covering persist/revert/recover, the toggle's downstream emit,
the dtz/resolution coupling in both modes, and cross-sample persistence.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
